{"id":3601,"date":"2025-03-20T17:19:10","date_gmt":"2025-03-20T17:19:10","guid":{"rendered":"https:\/\/securitybriefing.net\/?p=3601"},"modified":"2025-03-20T17:44:33","modified_gmt":"2025-03-20T17:44:33","slug":"hoe-lang-is-600-seconden","status":"publish","type":"post","link":"https:\/\/securitybriefing.net\/nl\/gegevens\/hoe-lang-is-600-seconden\/","title":{"rendered":"Hoe lang is 600 seconden?"},"content":{"rendered":"<div class=\"time-calculator-container\">    \n    <div class=\"quick-answer-section\">\n        <div class=\"quick-answer\">\n            <span>600 seconden = 10 minuten = 1\/6 van een uur = 0,1667 uur = 0,0069 dagen = 600.000 milliseconden<\/span>\n        <\/div>\n        \n        <div class=\"timer-container\">\n            <div class=\"timer\" id=\"countdownTimer\">\n                <svg class=\"progress-ring\" width=\"160\" height=\"160\">\n                    <circle class=\"progress-ring__circle-bg\" stroke=\"#e0e0e0\" stroke-width=\"8\" fill=\"transparent\" r=\"70\" cx=\"80\" cy=\"80\"\/>\n                    <circle class=\"progress-ring__circle\" stroke=\"#44D1AB\" stroke-width=\"8\" fill=\"transparent\" r=\"70\" cx=\"80\" cy=\"80\"\/>\n                <\/svg>\n                <div class=\"time\">10:00<\/div>\n            <\/div>\n            <button id=\"startTimerBtn\" class=\"timer-button\">Timer van 600 seconden starten<\/button>\n        <\/div>\n    <\/div>\n    \n    <div class=\"calculator-section\">\n        <h2>Rekenmachine voor tijdconversie<\/h2>\n        <div class=\"calculator\">\n            <div class=\"input-group\">\n                <input type=\"number\" id=\"secondsInput\" placeholder=\"Seconden invoeren\" value=\"600\">\n                <button id=\"calculateBtn\">Converteer<\/button>\n            <\/div>\n            \n            <div class=\"results\" id=\"calculationResults\">\n                <div class=\"result-item\">\n                    <span class=\"result-label\">Notulen:<\/span>\n                    <span class=\"result-value\" id=\"minutesResult\">10<\/span>\n                <\/div>\n                <div class=\"result-item\">\n                    <span class=\"result-label\">Uren:<\/span>\n                    <span class=\"result-value\" id=\"hoursResult\">0.1667<\/span>\n                <\/div>\n                <div class=\"result-item\">\n                    <span class=\"result-label\">Dagen:<\/span>\n                    <span class=\"result-value\" id=\"daysResult\">0.0069<\/span>\n                <\/div>\n                <div class=\"result-item\">\n                    <span class=\"result-label\">Milliseconden:<\/span>\n                    <span class=\"result-value\" id=\"msResult\">600,000<\/span>\n                <\/div>\n                <div class=\"result-item\">\n                    <span class=\"result-label\">Microseconden:<\/span>\n                    <span class=\"result-value\" id=\"microResult\">600,000,000<\/span>\n                <\/div>\n                <div class=\"result-item\">\n                    <span class=\"result-label\">Menselijk leesbaar:<\/span>\n                    <span class=\"result-value\" id=\"readableResult\">600 seconden = 10 minuten precies<\/span>\n                <\/div>\n            <\/div>\n        <\/div>\n        \n        <div class=\"reverse-calculator\">\n            <h3>Omgekeerde rekenmachine<\/h3>\n            <div class=\"input-group\">\n                <input type=\"number\" id=\"minutesInput\" placeholder=\"Voer minuten in\" value=\"10\">\n                <button id=\"reverseCalculateBtn\">Converteren naar seconden<\/button>\n            <\/div>\n            <div class=\"result-item\">\n                <span class=\"result-label\">Seconden:<\/span>\n                <span class=\"result-value\" id=\"reverseResult\">600<\/span>\n            <\/div>\n        <\/div>\n    <\/div>\n    \n    <div class=\"conversion-table-section\">\n        <h2>Tijdconversietabel<\/h2>\n        <div class=\"table-container\">\n            <table class=\"conversion-table\">\n                <thead>\n                    <tr>\n                        <th>Seconden<\/th>\n                        <th>Notulen<\/th>\n                        <th>Uren<\/th>\n                        <th>Milliseconden<\/th>\n                        <th>Dagen<\/th>\n                    <\/tr>\n                <\/thead>\n                <tbody>\n                    <tr>\n                        <td>60 sec<\/td>\n                        <td>1 min<\/td>\n                        <td>0,0167 uur<\/td>\n                        <td>60.000 ms<\/td>\n                        <td>0,0007 dag<\/td>\n                    <\/tr>\n                    <tr>\n                        <td>300 sec<\/td>\n                        <td>5 min<\/td>\n                        <td>0,0833 uur<\/td>\n                        <td>300.000 ms<\/td>\n                        <td>0,0035 dag<\/td>\n                    <\/tr>\n                    <tr class=\"highlighted\">\n                        <td>600 sec<\/td>\n                        <td>10 min<\/td>\n                        <td>0,1667 uur<\/td>\n                        <td>600.000 ms<\/td>\n                        <td>0,0069 dag<\/td>\n                    <\/tr>\n                    <tr>\n                        <td>1.800 sec<\/td>\n                        <td>30 min<\/td>\n                        <td>0,5 uur<\/td>\n                        <td>1.800.000 ms<\/td>\n                        <td>0,0208 dag<\/td>\n                    <\/tr>\n                    <tr>\n                        <td>3.600 sec<\/td>\n                        <td>60 min<\/td>\n                        <td>1 uur<\/td>\n                        <td>3.600.000 ms<\/td>\n                        <td>0,0417 dag<\/td>\n                    <\/tr>\n                <\/tbody>\n            <\/table>\n        <\/div>\n    <\/div>\n    \n    <div class=\"real-life-context\">\n        <h2>Wat kun je doen in 600 seconden?<\/h2>\n        <div class=\"activities-grid\">\n            <div class=\"activity-card\">\n                <div class=\"activity-icon\">\ud83e\udd5a<\/div>\n                <div class=\"activity-title\">Een ei koken<\/div>\n                <div class=\"activity-time\">6-10 minuten<\/div>\n            <\/div>\n            <div class=\"activity-card\">\n                <div class=\"activity-icon\">\ud83c\udfb5<\/div>\n                <div class=\"activity-title\">Luister naar 2-3 popsongs<\/div>\n                <div class=\"activity-time\">~3 minuten elk<\/div>\n            <\/div>\n            <div class=\"activity-card\">\n                <div class=\"activity-icon\">\ud83c\udfc3<\/div>\n                <div class=\"activity-title\">Ren 1-2 km (gemiddeld tempo)<\/div>\n                <div class=\"activity-time\">8-12 minuten<\/div>\n            <\/div>\n            <div class=\"activity-card\">\n                <div class=\"activity-icon\">\u2615<\/div>\n                <div class=\"activity-title\">Zet een French press koffie<\/div>\n                <div class=\"activity-time\">4 minuten + voorbereiding<\/div>\n            <\/div>\n            <div class=\"activity-card\">\n                <div class=\"activity-icon\">\ud83e\uddd8<\/div>\n                <div class=\"activity-title\">Mediteer of doe een powernap<\/div>\n                <div class=\"activity-time\">10 minuten<\/div>\n            <\/div>\n            <div class=\"activity-card\">\n                <div class=\"activity-icon\">\ud83c\udf5c<\/div>\n                <div class=\"activity-title\">Instant noedels koken<\/div>\n                <div class=\"activity-time\">3-5 minuten<\/div>\n            <\/div>\n        <\/div>\n    <\/div>\n    \n    <div class=\"educational-section\">\n        <h2>Waarom 60 seconden in een minuut?<\/h2>\n        <div class=\"historical-insight\">\n            <p>De verdeling van tijd in 60 seconden per minuut gaat terug tot de oude Babyloni\u00ebrs die rond 3000 voor Christus een sexagesimaal (basis-60) systeem gebruikten. Dit systeem was ideaal voor berekeningen omdat 60 veel delers heeft (1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30), waardoor het praktisch was voor breuken.<\/p>\n            <p>De Babyloni\u00ebrs erfden hun getallenstelsel van de Sumeri\u00ebrs, die het al in 3500 voor Christus gebruikten. Later namen Griekse astronomen als Hipparchus en Ptolemaeus dit systeem over voor geografische co\u00f6rdinaten. Via Islamitische wetenschappers in de Middeleeuwen bereikte deze tijdverdelingsmethode uiteindelijk Europa, waar het gestandaardiseerd werd.<\/p>\n            <p>De volgende keer dat je 600 seconden voorbij ziet tikken, ervaar je een tijdmeetsysteem met wortels van meer dan 5000 jaar oud!<\/p>\n        <\/div>\n    <\/div>\n    \n    <div class=\"psychology-section\">\n        <h2>Tijdsperceptie: Hoe lang voelt 600 seconden?<\/h2>\n        <div class=\"perception-container\">\n            <div class=\"perception-item\">\n                <div class=\"perception-title\">Wachten in de rij of op een afspraak<\/div>\n                <div class=\"perception-bar\">\n                    <div class=\"perception-fill\" style=\"width: 90%\"><\/div>\n                <\/div>\n                <div class=\"perception-label\">Voelt erg lang<\/div>\n            <\/div>\n            <div class=\"perception-item\">\n                <div class=\"perception-title\">Werken aan een uitdagende taak<\/div>\n                <div class=\"perception-bar\">\n                    <div class=\"perception-fill\" style=\"width: 40%\"><\/div>\n                <\/div>\n                <div class=\"perception-label\">Voelt matig<\/div>\n            <\/div>\n            <div class=\"perception-item\">\n                <div class=\"perception-title\">Een interessante video bekijken<\/div>\n                <div class=\"perception-bar\">\n                    <div class=\"perception-fill\" style=\"width: 20%\"><\/div>\n                <\/div>\n                <div class=\"perception-label\">Voelt kort<\/div>\n            <\/div>\n            <div class=\"perception-item\">\n                <div class=\"perception-title\">Een videospel spelen<\/div>\n                <div class=\"perception-bar\">\n                    <div class=\"perception-fill\" style=\"width: 10%\"><\/div>\n                <\/div>\n                <div class=\"perception-label\">Voelt erg kort<\/div>\n            <\/div>\n        <\/div>\n        <p class=\"perception-note\">De tijd lijkt te vertragen als we ons vervelen, angstig zijn of wachten. Het versnelt wanneer we bezig zijn, genieten of gefocust zijn op een taak. Dit staat in de psychologie bekend als de \"tijdperceptieparadox\".<\/p>\n    <\/div>\n    \n    <div class=\"challenge-section\">\n        <h2>Uitdaging van 600 seconden<\/h2>\n        <div class=\"challenge-container\">\n            <p>Ga de 600-secondenuitdaging aan! Kies hieronder een activiteit, druk op de startknop en kijk hoe 10 minuten voelen:<\/p>\n            <div class=\"challenge-options\">\n                <button class=\"challenge-option\" data-activity=\"meditate\">Mediteer<\/button>\n                <button class=\"challenge-option\" data-activity=\"journal\">Schrijf in een dagboek<\/button>\n                <button class=\"challenge-option\" data-activity=\"stretch\">Rek- en strekoefeningen doen<\/button>\n            <\/div>\n            <div class=\"challenge-timer-container\">\n                <div class=\"timer challenge-timer-display\">\n                    <svg class=\"progress-ring\" width=\"160\" height=\"160\">\n                        <circle class=\"progress-ring__circle-bg\" stroke=\"#e0e0e0\" stroke-width=\"8\" fill=\"transparent\" r=\"70\" cx=\"80\" cy=\"80\"\/>\n                        <circle class=\"progress-ring__circle-challenge\" stroke=\"#44D1AB\" stroke-width=\"8\" fill=\"transparent\" r=\"70\" cx=\"80\" cy=\"80\"\/>\n                    <\/svg>\n                    <div class=\"time\" id=\"challengeTimer\">10:00<\/div>\n                <\/div>\n                <button id=\"startChallengeBtn\" class=\"challenge-button\" disabled>Selecteer eerst een activiteit<\/button>\n            <\/div>\n            <div id=\"challengeMessage\" class=\"challenge-message\" style=\"display: none;\">\n                <p>Hoe voelde dat? Voelden 600 seconden lang of kort?<\/p>\n            <\/div>\n        <\/div>\n    <\/div>\n    \n    <div class=\"advanced-breakdown\">\n        <h2>Geavanceerde tijdsindeling<\/h2>\n        <table class=\"advanced-table\">\n            <tbody>\n                <tr>\n                    <td>Seconden<\/td>\n                    <td>600 sec<\/td>\n                <\/tr>\n                <tr>\n                    <td>Notulen<\/td>\n                    <td>10 min<\/td>\n                <\/tr>\n                <tr>\n                    <td>Uren<\/td>\n                    <td>0,1667 uur<\/td>\n                <\/tr>\n                <tr>\n                    <td>Milliseconden<\/td>\n                    <td>600.000 ms<\/td>\n                <\/tr>\n                <tr>\n                    <td>Microseconden<\/td>\n                    <td>600.000.000 \u00b5s<\/td>\n                <\/tr>\n                <tr>\n                    <td>Nanoseconden<\/td>\n                    <td>600.000.000.000 ns<\/td>\n                <\/tr>\n                <tr>\n                    <td>Dagen<\/td>\n                    <td>0,0069 dag<\/td>\n                <\/tr>\n                <tr>\n                    <td>Weken<\/td>\n                    <td>0,00099 week<\/td>\n                <\/tr>\n            <\/tbody>\n        <\/table>\n    <\/div>\n<\/div>\n\n<style>\n    \/* Base styling *\/\n    .time-calculator-container {\n        font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;\n        max-width: 1200px;\n        margin: 0 auto;\n        padding: 30px;\n        color: #333;\n        line-height: 1.6;\n    }\n    \n    h1, h2, h3 {\n        color: #01175E;\n        margin-bottom: 20px;\n    }\n    \n    h1 {\n        font-size: 2.5rem;\n        text-align: center;\n        margin-bottom: 30px;\n    }\n    \n    h2 {\n        font-size: 1.8rem;\n        border-bottom: 2px solid #44D1AB;\n        padding-bottom: 10px;\n        margin-top: 40px;\n    }\n    \n    h3 {\n        font-size: 1.4rem;\n    }\n    \n    \/* Quick answer section *\/\n    .quick-answer-section {\n        display: flex;\n        flex-wrap: wrap;\n        justify-content: space-between;\n        align-items: center;\n        background-color: rgba(68, 209, 171, 0.1);\n        border-radius: 15px;\n        padding: 30px;\n        margin-bottom: 40px;\n    }\n    \n    .quick-answer {\n        flex: 1;\n        min-width: 300px;\n    }\n    \n    .quick-answer span {\n        font-size: 1.6rem;\n        font-weight: bold;\n        color: #01175E;\n        line-height: 1.4;\n    }\n    \n    .timer-container {\n        display: flex;\n        flex-direction: column;\n        align-items: center;\n        margin-left: 20px;\n    }\n    \n    .timer {\n        position: relative;\n        width: 160px;\n        height: 160px;\n        display: flex;\n        justify-content: center;\n        align-items: center;\n        margin-bottom: 15px;\n    }\n    \n    .time {\n        position: absolute;\n        font-size: 2rem;\n        font-weight: bold;\n        color: #01175E;\n        z-index: 2;\n    }\n    \n    .progress-ring {\n        position: absolute;\n        top: 0;\n        left: 0;\n    }\n    \n    .progress-ring__circle-bg {\n        stroke-opacity: 0.3;\n    }\n    \n    .progress-ring__circle, .progress-ring__circle-challenge {\n        stroke-dasharray: 440; \/* 2 * PI * 70 *\/\n        stroke-dashoffset: 0;\n        transform: rotate(-90deg);\n        transform-origin: 50% 50%;\n        transition: stroke-dashoffset 1s linear;\n    }\n    \n    .timer-button, .challenge-button, .challenge-option {\n        background-color: #44D1AB;\n        color: white;\n        border: none;\n        padding: 10px 20px;\n        border-radius: 25px;\n        font-weight: bold;\n        cursor: pointer;\n        transition: background-color 0.3s ease;\n    }\n    \n    .timer-button:hover, .challenge-button:hover, .challenge-option:hover {\n        background-color: #01175E;\n    }\n    \n    .timer-button:disabled, .challenge-button:disabled {\n        background-color: #cccccc;\n        cursor: not-allowed;\n    }\n    \n    \/* Calculator section *\/\n    .calculator-section {\n        background-color: #f9f9f9;\n        border-radius: 15px;\n        padding: 30px;\n        margin-bottom: 40px;\n        box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);\n    }\n    \n    .calculator, .reverse-calculator {\n        margin-bottom: 30px;\n    }\n    \n    .input-group {\n        display: flex;\n        margin-bottom: 20px;\n    }\n    \n    input {\n        flex: 1;\n        padding: 12px 15px;\n        border: 2px solid #ddd;\n        border-radius: 8px;\n        font-size: 1rem;\n    }\n    \n    input:focus {\n        border-color: #44D1AB;\n        outline: none;\n    }\n    \n    button {\n        background-color: #01175E;\n        color: white;\n        border: none;\n        padding: 12px 20px;\n        margin-left: 10px;\n        border-radius: 8px;\n        cursor: pointer;\n        font-weight: bold;\n        transition: background-color 0.3s ease;\n    }\n    \n    button:hover {\n        background-color: #44D1AB;\n    }\n    \n    .results {\n        background-color: white;\n        border-radius: 8px;\n        padding: 20px;\n        box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);\n    }\n    \n    .result-item {\n        display: flex;\n        justify-content: space-between;\n        padding: 10px 0;\n        border-bottom: 1px solid #eee;\n    }\n    \n    .result-item:last-child {\n        border-bottom: none;\n    }\n    \n    .result-label {\n        font-weight: bold;\n        color: #01175E;\n    }\n    \n    .result-value {\n        color: #44D1AB;\n        font-weight: 600;\n    }\n    \n    \/* Conversion table *\/\n    .table-container {\n        overflow-x: auto;\n    }\n    \n    .conversion-table {\n        width: 100%;\n        border-collapse: collapse;\n        margin-bottom: 30px;\n    }\n    \n    .conversion-table th, .conversion-table td {\n        padding: 15px;\n        text-align: center;\n        border-bottom: 1px solid #ddd;\n    }\n    \n    .conversion-table th {\n        background-color: #01175E;\n        color: white;\n    }\n    \n    .conversion-table tr:hover {\n        background-color: rgba(68, 209, 171, 0.1);\n    }\n    \n    .highlighted {\n        background-color: rgba(68, 209, 171, 0.2);\n        font-weight: bold;\n    }\n    \n    \/* Real-life context *\/\n    .activities-grid {\n        display: grid;\n        grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));\n        gap: 20px;\n        margin-bottom: 30px;\n    }\n    \n    .activity-card {\n        background-color: white;\n        border-radius: 10px;\n        padding: 20px;\n        box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);\n        text-align: center;\n        transition: transform 0.3s ease;\n    }\n    \n    .activity-card:hover {\n        transform: translateY(-5px);\n    }\n    \n    .activity-icon {\n        font-size: 2.5rem;\n        margin-bottom: 10px;\n    }\n    \n    .activity-title {\n        font-weight: bold;\n        color: #01175E;\n        margin-bottom: 5px;\n    }\n    \n    .activity-time {\n        color: #44D1AB;\n    }\n    \n    \/* Educational section *\/\n    .historical-insight {\n        background-color: rgba(1, 23, 94, 0.05);\n        border-left: 4px solid #01175E;\n        padding: 20px;\n        border-radius: 0 10px 10px 0;\n    }\n    \n    .historical-insight p {\n        margin-bottom: 15px;\n    }\n    \n    \/* Psychology section *\/\n    .perception-container {\n        margin: 30px 0;\n    }\n    \n    .perception-item {\n        margin-bottom: 20px;\n    }\n    \n    .perception-title {\n        font-weight: bold;\n        margin-bottom: 5px;\n    }\n    \n    .perception-bar {\n        height: 20px;\n        background-color: #e9e9e9;\n        border-radius: 10px;\n        overflow: hidden;\n    }\n    \n    .perception-fill {\n        height: 100%;\n        background-color: #44D1AB;\n        border-radius: 10px;\n    }\n    \n    .perception-label {\n        text-align: right;\n        font-size: 0.9rem;\n        color: #666;\n        margin-top: 5px;\n    }\n    \n    .perception-note {\n        font-style: italic;\n        color: #666;\n    }\n    \n    \/* Challenge section *\/\n    .challenge-container {\n        background-color: #f9f9f9;\n        border-radius: 15px;\n        padding: 30px;\n        text-align: center;\n    }\n    \n    .challenge-options {\n        display: flex;\n        justify-content: center;\n        flex-wrap: wrap;\n        gap: 15px;\n        margin: 20px 0;\n    }\n    \n    .challenge-timer-container {\n        display: flex;\n        flex-direction: column;\n        align-items: center;\n        margin: 30px 0;\n    }\n    \n    .challenge-timer-display {\n        margin-bottom: 20px;\n    }\n    \n    .challenge-message {\n        background-color: #44D1AB;\n        color: white;\n        padding: 15px;\n        border-radius: 10px;\n        font-weight: bold;\n        animation: fadeIn 0.5s ease;\n    }\n    \n    @keyframes fadeIn {\n        from { opacity: 0; }\n        to { opacity: 1; }\n    }\n    \n    \/* Advanced breakdown *\/\n    .advanced-table {\n        width: 100%;\n        border-collapse: collapse;\n    }\n    \n    .advanced-table td {\n        padding: 12px 15px;\n        border-bottom: 1px solid #ddd;\n    }\n    \n    .advanced-table tr td:first-child {\n        font-weight: bold;\n        color: #01175E;\n        width: 40%;\n    }\n    \n    .advanced-table tr:nth-child(even) {\n        background-color: rgba(68, 209, 171, 0.05);\n    }\n    \n    \/* Responsive design *\/\n    @media (max-width: 768px) {\n        .time-calculator-container {\n            padding: 15px;\n        }\n        \n        h1 {\n            font-size: 2rem;\n        }\n        \n        .quick-answer-section {\n            flex-direction: column;\n            padding: 20px;\n        }\n        \n        .quick-answer {\n            margin-bottom: 20px;\n            min-width: auto;\n        }\n        \n        .quick-answer span {\n            font-size: 1.2rem;\n        }\n        \n        .input-group {\n            flex-direction: column;\n        }\n        \n        input {\n            margin-bottom: 10px;\n        }\n        \n        button {\n            margin-left: 0;\n        }\n        \n        .activities-grid {\n            grid-template-columns: 1fr;\n        }\n    }\n<\/style>\n\n<script>\n    document.addEventListener('DOMContentLoaded', function() {\n        \/\/ Calculator functions\n        document.getElementById('calculateBtn').addEventListener('click', function() {\n            const seconds = parseFloat(document.getElementById('secondsInput').value);\n            if (isNaN(seconds)) return;\n            \n            const minutes = seconds \/ 60;\n            const hours = minutes \/ 60;\n            const days = hours \/ 24;\n            const milliseconds = seconds * 1000;\n            const microseconds = milliseconds * 1000;\n            \n            document.getElementById('minutesResult').textContent = minutes.toFixed(2);\n            document.getElementById('hoursResult').textContent = hours.toFixed(4);\n            document.getElementById('daysResult').textContent = days.toFixed(4);\n            document.getElementById('msResult').textContent = milliseconds.toLocaleString();\n            document.getElementById('microResult').textContent = microseconds.toLocaleString();\n            \n            \/\/ Human readable format\n            let readable = `${seconds} seconds = `;\n            if (seconds === 60) {\n                readable += \"exactly 1 minute\";\n            } else if (seconds % 60 === 0) {\n                readable += `exactly ${minutes} minutes`;\n            } else if (seconds < 60) {\n                readable += `less than 1 minute`;\n            } else {\n                const wholeMinutes = Math.floor(minutes);\n                const remainingSeconds = seconds % 60;\n                readable += `${wholeMinutes} minute${wholeMinutes !== 1 ? 's' : ''} and ${remainingSeconds} second${remainingSeconds !== 1 ? 's' : ''}`;\n            }\n            \n            document.getElementById('readableResult').textContent = readable;\n        });\n        \n        \/\/ Reverse calculator\n        document.getElementById('reverseCalculateBtn').addEventListener('click', function() {\n            const minutes = parseFloat(document.getElementById('minutesInput').value);\n            if (isNaN(minutes)) return;\n            \n            const seconds = minutes * 60;\n            document.getElementById('reverseResult').textContent = seconds;\n        });\n        \n        \/\/ 600 second timer\n        let countdown;\n        const circle = document.querySelector('.progress-ring__circle');\n        const circumference = 2 * Math.PI * 70; \/\/ 2\u03c0r (r=70)\n        circle.style.strokeDasharray = circumference;\n        circle.style.strokeDashoffset = '0';\n        \n        document.getElementById('startTimerBtn').addEventListener('click', function() {\n            if (countdown) {\n              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document.getElementById('startTimerBtn').textContent = 'Start 600 Second Timer';\n                    countdown = null;\n                    return;\n                }\n                \n                \/\/ Update timer display\n                const minutes = Math.floor(timeLeft \/ 60);\n                const seconds = timeLeft % 60;\n                document.getElementById('countdownTimer').querySelector('.time').textContent = \n                    `${minutes}:${seconds.toString().padStart(2, '0')}`;\n                \n                \/\/ Update progress ring\n                const progress = elapsed \/ 600;\n                const dashoffset = circumference * progress;\n                circle.style.strokeDashoffset = dashoffset;\n                \n            }, 1000);\n        });\n        \n        \/\/ Challenge section\n        let selectedActivity = null;\n        let challengeCountdown;\n        const challengeCircle = 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