diff --git a/01 - JavaScript Drum Kit/index-START.html b/01 - JavaScript Drum Kit/index-START.html
index 4070d32767..ddd37c75a4 100644
--- a/01 - JavaScript Drum Kit/index-START.html	
+++ b/01 - JavaScript Drum Kit/index-START.html	
@@ -9,8 +9,8 @@
 
 
   <div class="keys">
-    <div data-key="65" class="key">
-      <kbd>A</kbd>
+    <div data-key="81" class="key">
+      <kbd>Q</kbd>
       <span class="sound">clap</span>
     </div>
     <div data-key="83" class="key">
@@ -47,7 +47,7 @@
     </div>
   </div>
 
-  <audio data-key="65" src="sounds/clap.wav"></audio>
+  <audio data-key="81" 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>
@@ -59,6 +59,24 @@
 
 <script>
 
+  function playSound(e) {
+    const audio = document.querySelector(`audio[data-key="${e.keyCode}"]`);
+    const key = document.querySelector(`.key[data-key="${e.keyCode}"]`);
+    if(!audio) return; // stop
+    audio.currentTime = 0;
+    audio.play();
+    key.classList.add('playing');
+  }
+
+  function removeTransition(e) {
+    if(e.propertyName !== 'transform') return;
+    this.classList.remove('playing');
+  }
+
+  const keys = document.querySelectorAll('.key');
+  keys.forEach(key => key.addEventListener('transitionend', removeTransition));
+  window.addEventListener('keydown', playSound);
+
 </script>
 
 
diff --git a/02 - JS + CSS Clock/index-START.html b/02 - JS + CSS Clock/index-START.html
index 2712384201..9f97fbaf3d 100644
--- a/02 - JS + CSS Clock/index-START.html	
+++ b/02 - JS + CSS Clock/index-START.html	
@@ -9,9 +9,9 @@
 
     <div class="clock">
       <div class="clock-face">
-        <div class="hand hour-hand"></div>
-        <div class="hand min-hand"></div>
         <div class="hand second-hand"></div>
+        <div class="hand min-hand"></div>
+        <div class="hand hour-hand"></div>
       </div>
     </div>
 
@@ -59,14 +59,50 @@
       width:50%;
       height:6px;
       background:black;
+      border-radius: 3px;
       position: absolute;
       top:50%;
+      transform-origin: 100%;
+      transform: rotate(90deg);
+      transition: all 0.5s;
+      transition-timing-function: cubic-bezier(0.26, 1.96, 0.65, 0.54);
+    }
+    .hour-hand {
+      width: 40%;
+      right: 50%;
+    }
+    .second-hand {
+      background: white;
     }
 
   </style>
 
   <script>
 
+    const hourHand = document.querySelector('.hour-hand');
+    const minuteHand = document.querySelector('.min-hand');
+    const secondHand = document.querySelector('.second-hand');
+
+    function setDate() {
+      const now = new Date();
+
+      const hour = now.getHours();
+      console.log(hour);
+      const hoursDegrees = ((hour / 60) * 360) + 90;
+      hourHand.style.transform = `rotate(${hoursDegrees}deg)`;
+
+      const min = now.getMinutes();
+      console.log(min);
+      const minutesDegrees = ((min / 60) * 360) + 90;
+      minuteHand.style.transform = `rotate(${minutesDegrees}deg)`;
+
+      const seconds = now.getSeconds();
+      const secondsDegrees = ((seconds / 60) * 360) + 90;
+      secondHand.style.transform = `rotate(${secondsDegrees}deg)`;
+
+    }
+
+    setInterval(setDate, 1000);
 
   </script>
 </body>
diff --git a/03 - CSS Variables/index-START.html b/03 - CSS Variables/index-START.html
index 7171607a8b..71eeff279a 100644
--- a/03 - CSS Variables/index-START.html	
+++ b/03 - CSS Variables/index-START.html	
@@ -21,6 +21,21 @@ <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: var(--base);
+      filter: blur(var(--blur));
+    }
+
+    .hl {
+      color: var(--base);
+    }
 
     /*
       misc styles, nothing to do with CSS variables
@@ -48,6 +63,16 @@ <h2>Update CSS Variables with <span class='hl'>JS</span></h2>
   </style>
 
   <script>
+    const inputs = document.querySelectorAll('.controls input');
+
+    function handleUpdate() {
+      const suffix = this.dataset.sizing || '';
+      document.documentElement.style.setProperty(`--${this.name}`, this.value + suffix);
+    }
+
+    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 4162bce339..9ee447d073 100644
--- a/04 - Array Cardio Day 1/index-START.html	
+++ b/04 - Array Cardio Day 1/index-START.html	
@@ -33,29 +33,61 @@
 
     // Array.prototype.filter()
     // 1. Filter the list of inventors for those who were born in the 1500's
+    const fifteen = inventors.filter(inventor => inventor.year >= 1500 && inventor.year < 1600);
+    console.table(fifteen);
 
     // Array.prototype.map()
     // 2. Give us an array of the inventors' first and last names
+    const fullNames = inventors.map(inventor => `${inventor.first} ${inventor.last}`);
+    console.log(fullNames);
 
     // Array.prototype.sort()
     // 3. Sort the inventors by birthdate, oldest to youngest
+    const ordered = inventors.sort((a,b) => a.year > b.year ? 1 : -1)
+    console.table(ordered);
 
     // Array.prototype.reduce()
     // 4. How many years did all the inventors live?
+    const totalYears = inventors.reduce((total, inventor) => {
+      return total + (inventor.passed - inventor.year)
+    }, 0);
+    console.log(totalYears);
 
     // 5. Sort the inventors by years lived
+    const oldest = inventors.sort(function(a,b) {
+      const lastGuy = a.passed - a.year;
+      const nextGuy = b.passed - b.year;
+      return lastGuy > nextGuy ? -1 : 1;
+    });
+    console.table(oldest);
 
     // 6. create a list of Boulevards in Paris that contain 'de' anywhere in the name
     // https://en.wikipedia.org/wiki/Category:Boulevards_in_Paris
-
+    // TODO
 
     // 7. sort Exercise
     // Sort the people alphabetically by last name
+    const alpha = people.sort((lastOne,nextOne) => {
+      const [aLast, aFirst] = lastOne.split(', ');
+      const [bLast, bFirst] = nextOne.split(', ');
+      return aLast > bLast ? 1 : -1;
+    });
+    console.log(alpha);
 
     // 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 transportation = data.reduce(function(obj, item) {
+      if(!obj[item]) {
+        obj[item] = 0;
+      }
+      obj[item]++;
+      return obj;
+    }, {});
+
+    console.log(transportation);
+
   </script>
 </body>
 </html>