SciShow
A Blood Test for Cancer
Since many cancers don’t have symptoms early on, they may go unnoticed until they are at an advanced stage. But that is changing, thanks to a newer, non-invasive tool.
Curated Video
How Lucid Dreaming Works
You may have heard of lucid dreaming, the type of dream where the dreamer is aware of dreaming. Is lucid dreaming a real phenomenon? Sleep expert Matthew Walker explains how much we know about lucid dreams so far. Tech Insider tells you...
Curated Video
Can You Solve Abraham Lincoln's Math Homework?
Little known fact: Abraham Lincoln was a very good math student! In this video I share the story of why he studied Euclid's Elements. I also share a problem he did while in school. He did in fact get the correct answer, and we can deduce...
Curated Video
Can You Solve George Washington's Math Homework? (And Abraham Lincoln's Too)
Today politicians do not much about mathematics. But interestingly George Washington and Abraham Lincoln both understood the value of mathematics. And amazingly manuscripts of their homework have survived and been preserved for hundreds...
Curated Video
The Quadratic Formula - Why Do We Complete The Square? INTUITIVE PROOF
The quadratic formula is really useful, but its derivation is confusing to many. Like what is the point of "completing the square" anyway? In this video, I show how "completing the square" has a geometric interpretation--you are actually...
Curated Video
HARD Geometry Problem With Clever Solution. The Integer Rectangle
A rectangle R is tiled by smaller rectangles, each of which has either an integer height or an integer width (or both). Prove the rectangle R also has an integer height or an integer width (or both). Blog post (text/image solution):...