diff --git a/01 - JavaScript Drum Kit/index-START.html b/01 - JavaScript Drum Kit/index-START.html
index 4070d32767..0d5363c22d 100644
--- a/01 - JavaScript Drum Kit/index-START.html	
+++ b/01 - JavaScript Drum Kit/index-START.html	
@@ -59,8 +59,31 @@
 
 <script>
 
+
+
+  function playSound(e){
+    console.log(e);
+    const audio = document.querySelector(`audio[data-key="${e.keyCode}"]`);
+    const key = document.querySelector(`.key[data-key="${e.keyCode}"]`);
+    if(!audio) return; //stop the function from running all together
+    audio.currentTime = 0; //rewind from the start
+    audio.play();
+    key.classList.add('playing');
+
+  }
+
+  function removeTransititon(e){
+    if(e.propertyName !== 'transform') return; // skip it if it is not a transform
+    this.classList.remove('playing');
+  }
+ 
+   const keys = document.querySelectorAll('.key');
+   keys.forEach(key => key.addEventListener('transitionend',removeTransititon));
+
+   document.addEventListener('keydown', playSound);
 </script>
 
 
 </body>
 </html>
+
diff --git a/01 - JavaScript Drum Kit/style.css b/01 - JavaScript Drum Kit/style.css
index 075578c930..b9b9f96e5f 100644
--- a/01 - JavaScript Drum Kit/style.css	
+++ b/01 - JavaScript Drum Kit/style.css	
@@ -32,7 +32,7 @@ body,html {
 }
 
 .playing {
-  transform: scale(1.1);
+  transform: scale(1.2);
   border-color: #ffc600;
   box-shadow: 0 0 1rem #ffc600;
 }
diff --git a/02 - JS and CSS Clock/index-START.html b/02 - JS and CSS Clock/index-START.html
index ee7eaefb1f..57f1f8de5c 100644
--- a/02 - JS and CSS Clock/index-START.html	
+++ b/02 - JS and CSS Clock/index-START.html	
@@ -62,12 +62,34 @@
       background:black;
       position: absolute;
       top:50%;
+      transform-origin: 100%;
+      transform: rotate(90deg);
+      transition: all 0.05s;
+      transition-timing-function: cubic-bezier(0.1, 2.7, 0.58, 1);
     }
 
   </style>
 
   <script>
+  	const secondHand = document.querySelector('.second-hand');
+  	const minuteHand = document.querySelector('.min-hand');
+  	const hourHand = document.querySelector('.hour-hand');
 
+  	function setDate(){
+  		const now = new Date();
+  		const seconds = now.getSeconds();
+  		const minutes = now.getMinutes();
+  		const hours = now.getHours();
+  		const secondsDegrees = (seconds / 60) * 360 + 90;
+  		const minutesDegrees = (minutes / 60) * 360 + 90;
+  		const hoursDegrees = (hours / 12) * 360 + 90;
+  		secondHand.style.transform = `rotate(${secondsDegrees}deg)`;
+  		minuteHand.style.transform = `rotate(${minutesDegrees}deg)`;
+  		hourHand.style.transform = `rotate(${hoursDegrees}deg)`;
+  		console.log(seconds);
+  	}
+
+  	setInterval(setDate, 1000);
 
   </script>
 </body>
diff --git a/03 - CSS Variables/index-START.html b/03 - CSS Variables/index-START.html
index 8a4f0d556e..86fc5d482a 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: yellow;
+  	  --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
@@ -45,6 +60,17 @@ <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 eec0ffc31d..c2f5172ebc 100644
--- a/04 - Array Cardio Day 1/index-START.html	
+++ b/04 - Array Cardio Day 1/index-START.html	
@@ -32,28 +32,68 @@
     // 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 lived = inventors.reduce((total, inventor)=> {return total + (inventor.passed - inventor.year);
+    	}, 0);
+    	console.log (lived);
 
     // 5. Sort the inventors by years lived
 
+    	const ordLived = inventors.sort(function (a,b) {
+    		const lastGuy = a.passed - a.year;
+    		const nextGuy = b.passed - b.year;
+
+    		return lastGuy > nextGuy ? -1 : 1;
+    		
+    	});
+
+    	console.table(ordLived);
+
     // 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 alphabetically = people.sort(function(lastOne, nextOne){
+	    	const [aLast, aFirst] = lastOne.split(', ');
+	    	const [bLast, bFirst] = nextOne.split(', ');
+	    	return aLast > bLast ? 1 : -1;
+    	});
+	    console.log(alphabetically);
     // 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>