Physical Science

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

Topics to Explore

Learn More / Page 12

How Anesthesia Works

If the idea of being completely knocked out by a cocktail of drugs while doctors operate on you freaks you out, you're not the only one. But that's not what anesthesia is all about it -- and it might scare you less if you understand how it works.

By Shanna Freeman Chemistry / Chemical Compounds

How Atomic Clocks Work

When the power goes out and is later restored, how do you know what time to set your clocks to? Have you ever wondered how time is regulated? Learn how scientists determine exact time.

By Douglas Dwyer Physical Science / Nuclear Science

How Caffeine Works

About 90 percent of Americans consume some form of caffeine every day: It's our most popular drug by far. What's so special about this stimulant?

By Marshall Brain, Charles W. Bryant & Matt Cunningham Chemistry / Chemical Compounds

How Helium Balloons Work

Helium balloons tend to fascinate adults and children alike (and it's not just the Donald Duck voice thing, though that is a big draw). Learn all about helium and why it floats!

By Marshall Brain Chemistry / Chemical Processes and Tests

How Lasers Work

Lasers are used in CD players, dental drills, eye surgery, and even tattoo removal. But what exactly is a laser? There are numerous types, but all lasers work basically the same way. Learn how they generate such concentrated beams of light.

By Matthew Weschler Physical Science / Optics