This reminds me of the kinda things that they would show to small children in a science class except it only needed a small bit more spit and polish.
The cartoon itself was well researched and scientifically arcute and used simple vocabulary to get it's point across clearly.
Your word selection doesn't really matter because clarity is the name of the game.
As for spit and polish.
I would have drawn all text seen in the animation instead of typing it because than you can draw the fonts.
The drawings were fine but you could try doing more unique facial expressions and body language in your characters to enhance comedic effect.
Take the time to observe people around you and pay special attention to there own facial cues and body language.
You can do a cartoony verison of those facial cues and body language that people actually do.
play around with the pupils in the eyes because you can read human/animal emotion on just the eyes alone.
You got the right idea on playing around with the facial muscles in the eyes themselves.
Cartoony expressions for the most part are an exaggerated version of the same kinda facial expressions that real people do but with less limitations.
You can also work on your line of action.
When that guy reaches for a piece of chalk than all parts of his body can move in subtle way.
if he kicks forward than his body leans back to maintain balance and when he reaches for a piece of chalk than he either leans forward or back.
Try reaching for pencil on the ground and observe your own body either leaning forward with your arm.
or leaning back away for your arm.
Other than these small nitpicks.
It was a well presented flash movie and I will look into your other movies.
-PowerRangerYELLOW