Calculus Shortcuts: U-Substitution in Terms of X

In calculus, U-Substitution is a fundamental process which allows you to integrate what would otherwise be an impossible integral, be it definite or indefinite. As the inverse (MORE)

A Matter of Gravity

In Aristotle's physics, gravity was the effect of objects seeking that proper place in the universe. There were many incorrect ideas that were tied up in this explanation. Eac (MORE)

Four Fates of a Photon

The appearance and color of an object depends on how light interacts with the object. There are four basic interactions which define how an object looks: surface reflection, a (MORE)