# Physical Science

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

### Brown Noise vs. White Noise: Which Is Best for Quality Sleep?

### Can a sound wave kill you?

### Can two cans and a string really be used to talk over a distance?

### Delta-8 vs. Delta-9: Comparing Types of THC

### Strong Bases: Properties, Applications and Examples

### Comparing Strong Acids and Weak Acids

### How Electricity Works

### How Faraday Cages Work

### How Gasoline Works

### What do bugs have to do with forensic science?

### 5 Things You Didn't Know About Autopsies

### Do a Person’s Fingerprints Change After Death?

### How Alchemy Paved the Way for Chemistry

### How did Nikola Tesla change the way we use energy?

### Time May Not Exist, Say Some Physicists and Philosophers

### Why Does Ice Stick to Your Fingers?

### What if I forgot to remove a piercing before an MRI?

### A Kid-friendly Introduction to Magnets and Magnetism

### The Coordinate Plane Comprises 2 Axes and 4 Quadrants

### How a Place Value Chart Reveals a Digit's Position in a Number

### What Are Supplementary Angles?

### 5 Hugely Fun Facts About Mass (Not Weight)

### Antarctica's Spooky Cosmic Rays Might Shatter Physics As We Know It

### Entropy: The Invisible Force That Brings Disorder to the Universe

### The Demon Core: A Tale of Atomic Ambition and Tragic Fate

### Half-Life Formula: Components and Applications

### Could an 'X17 Particle' Hint at a Fifth Force in the Universe?

### Why Are School Buses Yellow?

### HowStuffWorks: How To Draw An Impossible Shape

### What Are the Colors in the Visible Spectrum?

### Learn More / Page 3

Sir Isaac Newton's Law of Universal Gravitation helps put the laws of gravity into a mathematical formula. And the gravitational constant is the "G" in that formula.

By Mark Mancini

Both degrees and radians represent the measure of an angle in geometry. So, how do you convert one to the other?

By Mark Mancini

The main function of the Krebs cycle is to produce energy, stored and transported as ATP or GTP, to keep the human body up and running.

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If you have trouble sleeping you might have been told to get a white noise machine. But white isn't the only color of noise out there.

Converting kilogram measurements into pounds is not hard. We'll show you the textbook way plus two quick-and-dirty shortcuts.

By Mark Mancini

Most of the world uses meters, apart from the U.S. and a few other countries. So what's an easy way to convert from meters to feet and vice versa?

By Mark Mancini

Superacids are those with an acidity greater than sulfuric acid. So which is the most super of superacids and what exactly is it used for?

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A unit circle is an important part of trigonometry and can define right angle relationships known as sine, cosine and tangent.

A multiplication table is an easy-to-use grid of numbers that can help you learn to multiply quickly by using the chart and, eventually, your memory.

Real numbers are the opposite of imaginary numbers and include every number you can think of.

We all have favorite colors. But have you ever considered why you like one color more than another?

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Discovered in the early 1800s from a chunk of smuggled platinum ore, rhodium is the most valuable precious metal on the planet today, used mainly for keeping car emissions in check.

Numerators and denominators, oh my! It sounds complicated, but learning how to multiply fractions is easy. It just takes three simple steps.

Finding the range of a set of numbers is an easy subtraction problem!

Cadmium is a natural metal and the leading component in rechargeable batteries and solar cells. It is also highly toxic and heavily regulated.

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Dividing fractions is easy once you learn a couple of rules and remember three words — keep, change and flip.

A perfect square is a number, but it can also be explained using an actual square.

Thorium is in many ways safer than uranium for nuclear power production. But is it safe enough to bet on for our energy future?

Your eyes aren't playing tricks on you. Those mountains way off in the distance really do look blue, and it's because of how light wavelengths scatter in the atmosphere.

By Mark Mancini

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If you want to see a hologram, you don't have to look much farther than your wallet. But the most impressive holograms are large scale and illuminated with lasers or displayed in a darkened room with carefully directed lighting. Learn how a hologram, light and your brain work together make clear, 3-D images.

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.

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.

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?

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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!

Nuclear radiation can be extremely beneficial or extremely harmful -- it all depends on how it's used. Learn what nuclear radiation is all about.