diff --git a/01 - JavaScript Drum Kit/index-START.html b/01 - JavaScript Drum Kit/index-START.html
index 4070d32767..a8f120cbd4 100644
--- a/01 - JavaScript Drum Kit/index-START.html	
+++ b/01 - JavaScript Drum Kit/index-START.html	
@@ -9,56 +9,79 @@
 
 
   <div class="keys">
-    <div data-key="65" class="key">
+    <div data-key="65" class="key key-65">
       <kbd>A</kbd>
       <span class="sound">clap</span>
     </div>
-    <div data-key="83" class="key">
+    <div data-key="83" class="key key-83">
       <kbd>S</kbd>
       <span class="sound">hihat</span>
     </div>
-    <div data-key="68" class="key">
+    <div data-key="68" class="key key-68">
       <kbd>D</kbd>
       <span class="sound">kick</span>
     </div>
-    <div data-key="70" class="key">
+    <div data-key="70" class="key key-70">
       <kbd>F</kbd>
       <span class="sound">openhat</span>
     </div>
-    <div data-key="71" class="key">
+    <div data-key="71" class="key key-71">
       <kbd>G</kbd>
       <span class="sound">boom</span>
     </div>
-    <div data-key="72" class="key">
+    <div data-key="72" class="key key-72">
       <kbd>H</kbd>
       <span class="sound">ride</span>
     </div>
-    <div data-key="74" class="key">
+    <div data-key="74" class="key key-74">
       <kbd>J</kbd>
       <span class="sound">snare</span>
     </div>
-    <div data-key="75" class="key">
+    <div data-key="75" class="key key-75">
       <kbd>K</kbd>
       <span class="sound">tom</span>
     </div>
-    <div data-key="76" class="key">
+    <div data-key="76" class="key key-76">
       <kbd>L</kbd>
       <span class="sound">tink</span>
     </div>
   </div>
 
-  <audio data-key="65" src="sounds/clap.wav"></audio>
-  <audio data-key="83" src="sounds/hihat.wav"></audio>
-  <audio data-key="68" src="sounds/kick.wav"></audio>
-  <audio data-key="70" src="sounds/openhat.wav"></audio>
-  <audio data-key="71" src="sounds/boom.wav"></audio>
-  <audio data-key="72" src="sounds/ride.wav"></audio>
-  <audio data-key="74" src="sounds/snare.wav"></audio>
-  <audio data-key="75" src="sounds/tom.wav"></audio>
-  <audio data-key="76" src="sounds/tink.wav"></audio>
+  <audio data-key="65" class="js-audio-65" src="sounds/clap.wav"></audio>
+  <audio data-key="83" class="js-audio-83" src="sounds/hihat.wav"></audio>
+  <audio data-key="68" class="js-audio-68" src="sounds/kick.wav"></audio>
+  <audio data-key="70" class="js-audio-70" src="sounds/openhat.wav"></audio>
+  <audio data-key="71" class="js-audio-71" src="sounds/boom.wav"></audio>
+  <audio data-key="72" class="js-audio-72" src="sounds/ride.wav"></audio>
+  <audio data-key="74" class="js-audio-74" src="sounds/snare.wav"></audio>
+  <audio data-key="75" class="js-audio-75" src="sounds/tom.wav"></audio>
+  <audio data-key="76" class="js-audio-76" src="sounds/tink.wav"></audio>
 
 <script>
+  window.addEventListener('keydown', playSound);
 
+  function playSound(e) {
+    var keyCode = e.keyCode;
+    //add the 'playing' class to the div.key that has a data-key attribute that matches keyCode
+    var instrument = document.querySelector(`.key-${keyCode}`);
+    instrument.classList.add('playing');
+    
+    //play the corresponding audio
+    var audio = document.querySelector(`.js-audio-${keyCode}`)
+    if(!audio) {return;}
+    audio.currentTime = 0; //rewind to start
+    audio.play();
+
+    //set up the event listener for when the keyup happens on a key
+    function removeTransition(e) {
+      if(e.propertyName !== 'transform') return; //skip all but transform transitions
+      console.log(this);
+      this.classList.remove('playing');
+    }
+
+    var keys = document.querySelectorAll('.key');
+    keys.forEach(key => key.addEventListener('transitionend', removeTransition));
+  }
 </script>
 
 
diff --git a/02 - JS + CSS Clock/index-START.html b/02 - JS + CSS Clock/index-START.html
index 2712384201..56000c60aa 100644
--- a/02 - JS + CSS Clock/index-START.html	
+++ b/02 - JS + CSS Clock/index-START.html	
@@ -59,14 +59,61 @@
       width:50%;
       height:6px;
       background:black;
+      border-radius:10px;
       position: absolute;
       top:50%;
+      transform-origin: 100%;
+      transform: rotate(90deg);
+      transition: all 0.05s;
+      transition-timing-function: cubic-bezier(0, 1.5, 0.42, 1.36);
+    }
+    .hand.hour-hand {
+      width:30%;
+      left:20%;
+      height:12px;
+    }
+    .hand.min-hand {
+      height:9px;
     }
 
   </style>
 
   <script>
+  
+    
+    
+    const hourHand = document.querySelector('.hour-hand');
+
+    function setSecondHand() {
+      const now = new Date();
+      const secondHand = document.querySelector('.second-hand');
+      const seconds = now.getSeconds();
+      const secondsDegrees = (seconds / 60) * 360 + 90; //add 90 since we start with a 90deg offset, since rotation is left-to-right, doesn't start at 12 o'clock
+      secondHand.style.transform = `rotate(${secondsDegrees}deg)`;
+      setMinHand();
+      setHourHand();
+    }
 
+    function setMinHand() {
+      const now = new Date();
+      const minuteHand = document.querySelector('.min-hand');
+      const minutes = now.getMinutes();
+      const minutesDegrees = (minutes / 60) * 360 + 90;
+      minuteHand.style.transform = `rotate(${minutesDegrees}deg)`;
+    }
+
+    function setHourHand() {
+      const now = new Date();
+      const hours = now.getHours();
+      const hoursDegrees = hours > 12 ? (((hours-12)/12) * 360 + 90) : ((hours / 12) * 360 + 90);
+      hourHand.style.transform = `rotate(${hoursDegrees}deg)`;
+    }
+    setSecondHand();
+    setMinHand();
+    setHourHand();
+    setInterval(setSecondHand,1000);
+    // setInterval(setMinHand, (1000*60));
+    // setInterval(setHourHand, (1000 * 60 * 60));
 
   </script>
 </body>
diff --git a/03 - CSS Variables/index-START.html b/03 - CSS Variables/index-START.html
index 7171607a8b..1e5be487b4 100644
--- a/03 - CSS Variables/index-START.html	
+++ b/03 - CSS Variables/index-START.html	
@@ -9,10 +9,10 @@ <h2>Update CSS Variables with <span class='hl'>JS</span></h2>
 
   <div class="controls">
     <label for="spacing">Spacing:</label>
-    <input type="range" name="spacing" min="10" max="200" value="10" data-sizing="px">
+    <input type="range" name="spacing" min="10" max="200" value="10" data-units="px">
 
     <label for="blur">Blur:</label>
-    <input type="range" name="blur" min="0" max="25" value="10" data-sizing="px">
+    <input type="range" name="blur" min="0" max="25" value="10" data-units="px">
 
     <label for="base">Base Color</label>
     <input type="color" name="base" value="#ffc600">
@@ -21,6 +21,20 @@ <h2>Update CSS Variables with <span class='hl'>JS</span></h2>
   <img src="https://source.unsplash.com/7bwQXzbF6KE/800x500">
 
   <style>
+    :root {
+      --base: #ffc600;
+      --spacing: 10px;
+      --blur: 10px;
+    }
+
+    img {
+      padding: var(--spacing);
+      background-color: var(--base);
+      filter: blur(var(--blur));
+    }
+    .hl {
+      color: var(--base);
+    }
 
     /*
       misc styles, nothing to do with CSS variables
@@ -48,6 +62,16 @@ <h2>Update CSS Variables with <span class='hl'>JS</span></h2>
   </style>
 
   <script>
+    const inputs = document.querySelectorAll(
+    '.controls input');
+
+    function handleUpdate() {
+      const units = this.dataset.units || '';
+      document.documentElement.style.setProperty(`--${this.name}`, `${this.value}${units}`);
+    }
+
+    inputs.forEach(input => input.addEventListener('change', handleUpdate));
+    inputs.forEach(input => input.addEventListener('mousemove', handleUpdate));
   </script>
 
 </body>
diff --git a/04 - Array Cardio Day 1/index-START.html b/04 - Array Cardio Day 1/index-START.html
index 927fb03540..639e40d613 100644
--- a/04 - Array Cardio Day 1/index-START.html	
+++ b/04 - Array Cardio Day 1/index-START.html	
@@ -32,28 +32,76 @@
 
     // Array.prototype.filter()
     // 1. Filter the list of inventors for those who were born in the 1500's
+    console.log(inventors.filter(function(v) {
+      return v.year > 1499 && v.year < 1600;
+    }));
 
     // Array.prototype.map()
     // 2. Give us an array of the inventors' first and last names
+    console.log(
+      inventors.map(function(v){
+        return `${v.first} ${v.last}`;
+      })
+    );
+
+    //Age of each inventor
+    console.table(
+      inventors.map(function(v){
+        v.age = v.passed-v.year;
+        return v;
+      })
+    );
 
     // Array.prototype.sort()
     // 3. Sort the inventors by birthdate, oldest to youngest
-
+    var sorted = inventors.sort((a,b) => a.year - b.year);
+    console.table(sorted);
+    
     // Array.prototype.reduce()
     // 4. How many years did all the inventors live?
+    var totalAges = inventors.reduce(function(a,b){
+        a += b.passed-b.year;
+        return a;
+    }, 0)
+    console.log(totalAges);
 
     // 5. Sort the inventors by years lived
+    sorted = inventors.sort((a,b) => (a.age - b.age));
+    console.table(sorted);
 
     // 6. create a list of Boulevards in Paris that contain 'de' anywhere in the name
     // https://en.wikipedia.org/wiki/Category:Boulevards_in_Paris
-
+    // const wholeList = document.querySelector('.mw-category');
+    // const links = [...wholeList.querySelectorAll('a')];
+    // // const links = Array.from(wholeList.querySelectorAll('a'));
+    // const deStreets = links
+    //                   .map(item => item.textContent)
+    //                   .filter(item => item.includes('de'));
+    // console.log(deStreets);
 
     // 7. sort Exercise
     // Sort the people alphabetically by last name
+    const sortedPeople = people.sort(function(current, next){
+      //if sort returns a negative, then current will be before next
+      //if it returns a positive, then next will be before current
+      //if zero, then they won't move relative to each other
+      var thisLast = current.split(', ')[0];
+      var nextLast = next.split(', ')[0];
+      return thisLast < nextLast ? -1 : 1;
+    });
+    console.log(sortedPeople);
 
     // 8. Reduce Exercise
     // Sum up the instances of each of these
     const data = ['car', 'car', 'truck', 'truck', 'bike', 'walk', 'car', 'van', 'bike', 'walk', 'car', 'van', 'car', 'truck' ];
+    const instances = data.reduce(function(allVehicles, currentVehicle){
+      if (!(currentVehicle in allVehicles)) {
+        allVehicles[currentVehicle] = 0; //initialize that property
+      }
+      allVehicles[currentVehicle]++;
+      return allVehicles;
+    },{});
+    console.log(instances);
 
   </script>
 </body>
diff --git a/05 - Flex Panel Gallery/index-START.html b/05 - Flex Panel Gallery/index-START.html
index e1d643ad5c..98bdd8a8f6 100644
--- a/05 - Flex Panel Gallery/index-START.html	
+++ b/05 - Flex Panel Gallery/index-START.html	
@@ -24,9 +24,11 @@
     .panels {
       min-height:100vh;
       overflow: hidden;
+      display: flex;
     }
 
     .panel {
+      flex: 1;
       background:#6B0F9C;
       box-shadow:inset 0 0 0 5px rgba(255,255,255,0.1);
       color:white;
@@ -41,6 +43,10 @@
       font-size: 20px;
       background-size:cover;
       background-position:center;
+      justify-content: center;
+      align-items: center;
+      display: flex;
+      flex-direction: column;
     }
 
 
@@ -50,12 +56,29 @@
     .panel4 { background-image:url(https://source.unsplash.com/ITjiVXcwVng/1500x1500); }
     .panel5 { background-image:url(https://source.unsplash.com/3MNzGlQM7qs/1500x1500); }
 
+/* Flex Children */
     .panel > * {
       margin:0;
       width: 100%;
       transition:transform 0.5s;
+      flex: 1 0 auto;
+      display: flex;
+      justify-content: center;
+      align-items: center;
+    }
+    .panel > *:first-child {
+      transform: translateY(-100%);
+    }
+    .panel.open-active > *:first-child {
+      transform: translateY(0);
+    }
+    
+    .panel > *:last-child {
+      transform: translateY(100%);
+    }
+    .panel.open-active > *:last-child {
+      transform: translateY(0);
     }
-
     .panel p {
       text-transform: uppercase;
       font-family: 'Amatic SC', cursive;
@@ -68,6 +91,7 @@
 
     .panel.open {
       font-size:40px;
+      flex: 5;
     }
 
     .cta {
@@ -107,7 +131,26 @@
   </div>
 
   <script>
+    const panels = document.querySelectorAll('.panel');
+
+    function toggleOpen() {
+      if (this.classList.contains('open')) {
+        //closing an open panel
+        this.classList.remove('open');
+      } else {
+        //clicking another panel that isn't currently open
+        panels.forEach(panel => panel.classList.remove('open'));
+        this.classList.toggle('open');
+      }
+    }
 
+    function toggleActive(e) {
+      if(e.propertyName.includes('flex')) {
+        this.classList.toggle('open-active');
+      }
+    }
+    panels.forEach(panel => panel.addEventListener('click',toggleOpen));
+    panels.forEach(panel => panel.addEventListener('transitionend',toggleActive));
   </script>
 
 
diff --git a/06 - Type Ahead/index-START.html b/06 - Type Ahead/index-START.html
index 1436886918..773c7f7a6c 100644
--- a/06 - Type Ahead/index-START.html	
+++ b/06 - Type Ahead/index-START.html	
@@ -17,6 +17,45 @@
 <script>
 const endpoint = 'https://gist.githubusercontent.com/Miserlou/c5cd8364bf9b2420bb29/raw/2bf258763cdddd704f8ffd3ea9a3e81d25e2c6f6/cities.json';
 
+  const cities = [];
+
+  fetch(endpoint)
+    .then(blob => blob.json())
+    .then(data => cities.push(...data));
+
+  function findMatches(wordToMatch,cities) {
+    return cities.filter(place => {
+      let regex = new RegExp(wordToMatch, 'i');
+      return place.city.match(regex) || place.state.match(regex);
+    });
+  }
+
+  function numberWithThousandsSeparator(x) {
+    return x.toString().replace(/\B(?=(\d{3})+(?!\d))/g, ',');
+  }
+
+  function displayMatches() {
+    const matchArray = findMatches(this.value, cities);
+    const html = matchArray.map(place => {
+      //highlight found text
+      const regex = new RegExp(this.value, 'gi');
+      const cityName = place.city.replace(regex, '<span class="hl">$&</span>');
+      const stateName = place.state.replace(regex, '<span class="hl">$&</span>');
+      return `
+        <li>
+          <span class="name">${cityName}, ${stateName}</span>
+          <span class="population">pop. ${numberWithThousandsSeparator(place.population)}</span>
+        </li>
+      `;
+    }).join('');
+    suggestions.innerHTML = html;
+  }
+
+  const searchInput = document.querySelector('input.search');
+  const suggestions = document.querySelector('.suggestions');
+
+  searchInput.addEventListener('keyup',displayMatches);
+
 </script>
   </body>
 </html>
diff --git a/07 - Array Cardio Day 2/index-START.html b/07 - Array Cardio Day 2/index-START.html
index b80ab6b650..f30faa9180 100644
--- a/07 - Array Cardio Day 2/index-START.html	
+++ b/07 - Array Cardio Day 2/index-START.html	
@@ -2,7 +2,7 @@
 <html lang="en">
 <head>
   <meta charset="UTF-8">
-  <title>Document</title>
+  <title>ArrayCardio pt 2</title>
 </head>
 <body>
   <script>
@@ -25,15 +25,28 @@
 
     // Some and Every Checks
     // Array.prototype.some() // is at least one person 19?
+    var year = new Date().getFullYear();
+    const haveAdults = people.some(person => year-person.year >= 19);
+    console.log('have adults? ', haveAdults);
+    
     // Array.prototype.every() // is everyone 19?
+    const allAdults = people.every(person => year-person.year >= 19);
+    console.log('all adults? ', allAdults);
 
     // Array.prototype.find()
     // Find is like filter, but instead returns just the one you are looking for
     // find the comment with the ID of 823423
+    const comment = comments.find(comment => comment.id === 823423);
+    console.log("comment found:",comment);
 
     // Array.prototype.findIndex()
     // Find the comment with this ID
     // delete the comment with the ID of 823423
+    console.log('size before: ', comments.length);
+    const idx = comments.findIndex(comment => comment.id === 823423);
+    comments.splice(idx,1);
+    console.log('size after: ', comments.length, comments);
+
 
   </script>
 </body>
diff --git a/08 - Fun with HTML5 Canvas/index-START.html b/08 - Fun with HTML5 Canvas/index-START.html
index 37c148df07..06069caaf9 100644
--- a/08 - Fun with HTML5 Canvas/index-START.html	
+++ b/08 - Fun with HTML5 Canvas/index-START.html	
@@ -7,6 +7,46 @@
 <body>
 <canvas id="draw" width="800" height="800"></canvas>
 <script>
+  const canvas = document.querySelector('#draw');
+  const ctx = canvas.getContext('2d');
+
+  canvas.width = window.innerWidth;
+  canvas.height = window.innerHeight;
+  canvas.style.backgroundColor = '#e4e4d2';
+
+  ctx.strokeStyle = '#7200c7';
+  ctx.lineWidth = 5;
+  ctx.lineJoin = 'round';
+  ctx.lineCap = 'round';
+  // ctx.globalCompositeOperation = 'screen';
+
+  let isDrawing = false;  //on mousedown ==> true
+  let lastX = 0;
+  let lastY = 0;
+  let hue = 269; //purply
+
+  function draw(e) {
+    if(!isDrawing) return; //stop the function from running when not mousedown.
+    ctx.strokeStyle = `hsl(${hue}, 59%, 50%)`;
+    ctx.beginPath();
+    ctx.moveTo(lastX, lastY);
+    ctx.lineTo(e.offsetX, e.offsetY);
+    ctx.stroke();
+    ctx.closePath();
+    [lastX, lastY] = [ctx.offsetX, ctx.offsetY];
+    hue++;
+    if(hue >= 360) hue = 0;
+
+  }
+
+  canvas.addEventListener('mousemove', draw);
+  canvas.addEventListener('mousedown', (e) => {
+    isDrawing = true;
+    [lastX, lastY] = [e.offsetX, e.offsetY];
+  });
+  canvas.addEventListener('mouseup', () => isDrawing = false);
+  canvas.addEventListener('mouseout', () => isDrawing = false);
+
 </script>
 
 <style>
diff --git a/10 - Hold Shift and Check Checkboxes/index-START.html b/10 - Hold Shift and Check Checkboxes/index-START.html
index eb7ed310bb..7eed73f623 100644
--- a/10 - Hold Shift and Check Checkboxes/index-START.html	
+++ b/10 - Hold Shift and Check Checkboxes/index-START.html	
@@ -104,6 +104,34 @@
   </div>
 
 <script>
+  //get all the checkboxes
+  const checkboxes = document.querySelectorAll('[type=checkbox]');
+  let startIndex = 0;
+
+  checkboxes.forEach((checkbox, index, array) => {
+    checkbox.addEventListener('click', function makeSelections(e) {
+      //if checked without shift key, set startIndex
+      //if checked with shift key, set every element between startIndex and index to checked=true
+      if(e.shiftKey){
+        //check or uncheck each checkbox between startIndex and Index
+        if(index < startIndex) {
+          //we're going backwards, e.g. from index 4 to index 1, with index 1
+          //being the one that was clicked, so we don't want to change its checked value, and will start at the next item
+          for(let i = index + 1; i <= startIndex; i++) {
+            checkboxes[i].checked = e.target.checked;
+          }
+        } else {
+          //we're going forwards, but still don't want to change the checked status of index
+          for(let i = startIndex; i < index; i++) {
+            checkboxes[i].checked = e.target.checked;
+          }
+        }
+      } else {
+        //reset the startIndex to the index of whatever checkbox was just clicked
+        startIndex = index;
+      }
+    });
+  });
 </script>
 </body>
 </html>