# Physical Science

Physical science is the study of the physical world around you. Learn about everything from electricity to magnetism in this section.

You can find the distance between two points by using the distance formula. It's an application of the Pythagorean theorem. Remember that from high school algebra?

It's called fusion ignition and it's being hailed as a historic development in nuclear fusion that could pave the way for clean energy. We talked to a nuclear physicist who explained it all.

The very idea of trying to subtract one fraction from another may send you into convulsions of fear, but don't worry — we'll show you how.

Want to know the area of your pizza or the kitchen you're eating it in? Come on, and we'll show you how to figure it out with an area formula.

We take the mystery out of reporting the percent error correctly and show you how to use it in real life.

The Collatz conjecture can be worked on by 9-year-old math whizzes, but it's flummoxed some of the greatest minds of the past century. Will it ever be solved?

It looks completely impossible that this rock should stand, balanced as it is, but it has not moved since the last ice age.