diff --git a/01 - JavaScript Drum Kit/index-FINISHED.html b/01 - JavaScript Drum Kit/index-FINISHED.html
index 1a16d0997c..74862eeae1 100644
--- a/01 - JavaScript Drum Kit/index-FINISHED.html	
+++ b/01 - JavaScript Drum Kit/index-FINISHED.html	
@@ -58,23 +58,24 @@
   <audio data-key="76" src="sounds/tink.wav"></audio>
 
 <script>
-  function removeTransition(e) {
-    if (e.propertyName !== 'transform') return;
-    e.target.classList.remove('playing');
-  }
 
   function playSound(e) {
     const audio = document.querySelector(`audio[data-key="${e.keyCode}"]`);
     const key = document.querySelector(`div[data-key="${e.keyCode}"]`);
-    if (!audio) return;
-
-    key.classList.add('playing');
-    audio.currentTime = 0;
-    audio.play();
+    if(null != audio) {
+      key.classList.add("playing");
+      audio.currentTime = 0;
+      audio.play();
+    }
   }
-
-  const keys = Array.from(document.querySelectorAll('.key'));
-  keys.forEach(key => key.addEventListener('transitionend', removeTransition));
+  
+  function removeHighlight(e) {
+    this.classList.remove("playing");  
+  }
+  
+  keys = document.querySelectorAll(".key");
+  keys.forEach( key => key.addEventListener("transitionend", removeHighlight));
+  
   window.addEventListener('keydown', playSound);
 </script>
 
diff --git a/01 - JavaScript Drum Kit/style.css b/01 - JavaScript Drum Kit/style.css
index 3e0a320b37..2d1e7ec670 100644
--- a/01 - JavaScript Drum Kit/style.css	
+++ b/01 - JavaScript Drum Kit/style.css	
@@ -1,6 +1,6 @@
 html {
   font-size: 10px;
-  background:url(http://i.imgur.com/b9r5sEL.jpg) bottom center;
+  background:url(https://i.imgur.com/b9r5sEL.jpg) bottom center;
   background-size: cover;
 }
 body,html {
diff --git a/02 - JS + CSS Clock/index-FINISHED.html b/02 - JS + CSS Clock/index-FINISHED.html
index d4cb3b56a8..1495e879ad 100644
--- a/02 - JS + CSS Clock/index-FINISHED.html	
+++ b/02 - JS + CSS Clock/index-FINISHED.html	
@@ -69,30 +69,29 @@
 </style>
 
 <script>
-  const secondHand = document.querySelector('.second-hand');
-  const minsHand = document.querySelector('.min-hand');
-  const hourHand = document.querySelector('.hour-hand');
-
   function setDate() {
     const now = new Date();
-
+   
     const seconds = now.getSeconds();
-    const secondsDegrees = ((seconds / 60) * 360) + 90;
-    secondHand.style.transform = `rotate(${secondsDegrees}deg)`;
-
-    const mins = now.getMinutes();
-    const minsDegrees = ((mins / 60) * 360) + 90;
-    minsHand.style.transform = `rotate(${minsDegrees}deg)`;
-
-    const hour = now.getHours();
-    const hourDegrees = ((mins / 12) * 360) + 90;
-    hourHand.style.transform = `rotate(${hourDegrees}deg)`;
+    console.log(seconds);
+    const secElem = document.querySelector(".second-hand");
+    var degree = 360/60*seconds+90;
+    secElem.style.transform = `rotate(${degree}deg)`;
+    
+    const min = now.getMinutes();
+    const minElem = document.querySelector(".min-hand");
+    var degree = 360/60*min+90;
+    minElem.style.transform = `rotate(${degree}deg)`;
+    
+    const hours = now.getHours();
+    console.log(hours);
+    const hourElem = document.querySelector(".hour-hand");
+    var degree = 360/12*hours+90;
+    hourElem.style.transform = `rotate(${degree}deg)`;
+    
   }
-
+  
   setInterval(setDate, 1000);
-
-  setDate();
-
 </script>
 </body>
 </html>
diff --git a/03 - CSS Variables/index-FINISHED.html b/03 - CSS Variables/index-FINISHED.html
index 9401d7b339..9591caffef 100644
--- a/03 - CSS Variables/index-FINISHED.html	
+++ b/03 - CSS Variables/index-FINISHED.html	
@@ -68,15 +68,16 @@ <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(`--${this.name}`, this.value + suffix);
-    }
-
-    inputs.forEach(input => input.addEventListener('change', handleUpdate));
-    inputs.forEach(input => input.addEventListener('mousemove', handleUpdate));
+  const inputs = document.querySelectorAll('.controls input');
+   console.log(inputs);
+   
+   function handleUpdate() {
+     const suffix = this.dataset.sizing || '';
+     const name = this.name;
+     document.documentElement.style.setProperty(`--${name}`, this.value + suffix);
+   }
+   
+   inputs.forEach(input => input.addEventListener('change', handleUpdate));
   </script>
 
 
diff --git a/04 - Array Cardio Day 1/index-FINISHED.html b/04 - Array Cardio Day 1/index-FINISHED.html
index f68d8c3545..25146a7be9 100644
--- a/04 - Array Cardio Day 1/index-FINISHED.html	
+++ b/04 - Array Cardio Day 1/index-FINISHED.html	
@@ -18,82 +18,60 @@
       { first: 'Marie', last: 'Curie', year: 1867, passed: 1934 },
       { first: 'Johannes', last: 'Kepler', year: 1571, passed: 1630 },
       { first: 'Nicolaus', last: 'Copernicus', year: 1473, passed: 1543 },
-      { first: 'Max', last: 'Planck', year: 1858, passed: 1947 },
+      { first: 'Max', last: 'Planck', year: 1858, passed: 1947 }
     ];
 
+    const flavours = ['Chocolate Chip', 'Kulfi', 'Caramel Praline', 'Chocolate', 'Burnt Caramel', 'Pistachio', 'Rose', 'Sweet Coconut', 'Lemon Cookie', 'Toffeeness', 'Toasted Almond', 'Black Raspberry Crunch', 'Chocolate Brownies', 'Pistachio Almond', 'Strawberry', 'Lavender Honey', 'Lychee', 'Peach', 'Black Walnut', 'Birthday Cake', 'Mexican Chocolate', 'Mocha Almond Fudge', 'Raspberry'];
+
     const people = ['Beck, Glenn', 'Becker, Carl', 'Beckett, Samuel', 'Beddoes, Mick', 'Beecher, Henry', 'Beethoven, Ludwig', 'Begin, Menachem', 'Belloc, Hilaire', 'Bellow, Saul', 'Benchley, Robert', 'Benenson, Peter', 'Ben-Gurion, David', 'Benjamin, Walter', 'Benn, Tony', 'Bennington, Chester', 'Benson, Leana', 'Bent, Silas', 'Bentsen, Lloyd', 'Berger, Ric', 'Bergman, Ingmar', 'Berio, Luciano', 'Berle, Milton', 'Berlin, Irving', 'Berne, Eric', 'Bernhard, Sandra', 'Berra, Yogi', 'Berry, Halle', 'Berry, Wendell', 'Bethea, Erin', 'Bevan, Aneurin', 'Bevel, Ken', 'Biden, Joseph', 'Bierce, Ambrose', 'Biko, Steve', 'Billings, Josh', 'Biondo, Frank', 'Birrell, Augustine', 'Black Elk', 'Blair, Robert', 'Blair, Tony', 'Blake, William'];
 
     // 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);
-
+    var filtered = inventors.filter( function(inventor) {
+        return inventor.year >= 1500 && inventor.year < 1600;
+    });
+    console.log(filtered);
     // Array.prototype.map()
-    // 2. Give us an array of the inventor first and last names
-    const fullNames = inventors.map(inventor => `${inventor.first} ${inventor.last}`);
-    console.log(fullNames);
+    // 2. Give us an array of the inventory first and last names
+    var mapped = inventors.map( inventor => `${inventor.first} ${inventor.last}`);
+    console.log(mapped);
 
     // Array.prototype.sort()
     // 3. Sort the inventors by birthdate, oldest to youngest
-    // const ordered = inventors.sort(function(a, b) {
-    //   if(a.year > b.year) {
-    //     return 1;
-    //   } else {
-    //     return -1;
-    //   }
-    // });
-
-    const ordered = inventors.sort((a, b) => a.year > b.year ? 1 : -1);
-    console.table(ordered);
-
+   var sorted = inventors.sort( (a,b) => a.year > b.year ? 1 : -1 );
+   console.table(sorted);
     // 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);
+    var lives = inventors.reduce( (acc, inventor) => { return acc += (inventor.passed - inventor.year)}, 0 );
+    console.log(lives);
 
     // 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;
+    var sortedByAgesLived = inventors.sort( (a,b) => {
+      a.lived = a.passed - a.year;
+      return ( a.passed - a.year > b.passed - b.year ) ? 1 : -1;
     });
-    console.table(oldest);
+    console.table(sortedByAgesLived);
 
     // 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 category = document.querySelector('.mw-category');
-    // const links = Array.from(category.querySelectorAll('a'));
-    // const de = links
-    //             .map(link => link.textContent)
-    //             .filter(streetName => streetName.includes('de'));
-
     // 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);
-
+   var sortedPeople = people.sort( (a,b) => {
+    const [aLast, aFirst] = a.split(",");
+    const [bLast, bFirst] = b.split(",");
+    return aLast > bLast ? 1 : -1;
+   });
+   console.table(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', 'pogostick'];
-
-    const transportation = data.reduce(function(obj, item) {
-      if (!obj[item]) {
-        obj[item] = 0;
-      }
-      obj[item]++;
-      return obj;
-    }, {});
-
-    console.log(transportation);
+    const data = ['car', 'car', 'truck', 'truck', 'bike', 'walk', 'car', 'van', 'bike', 'walk', 'car', 'van', 'car', 'truck' ];
+    const instances = data.reduce( (acc, inst) => {
+      acc[inst] = (!acc[inst] ? 0 : acc[inst]) + 1;
+      return acc;
+    }, []);
+    console.table(instances);
 
   </script>
 </body>