Physical Science
Physical science is the study of the physical world around you. Learn about everything from electricity to magnetism in this section.
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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.
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.
Many people get speed and velocity confused. It's no surprise because the terms are often used interchangeably. But they're not quite the same thing. So how do you find the velocity of an object?
By Mark Mancini
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Cadmium is a natural metal and the leading component in rechargeable batteries and solar cells. It is also highly toxic and heavily regulated.
Converting kilogram measurements into pounds is not hard. We'll show you the textbook way plus two quick-and-dirty shortcuts.
By Mark Mancini
We all have favorite colors. But have you ever considered why you like one color more than another?
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
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Both degrees and radians represent the measure of an angle in geometry. So, how do you convert one to the other?
By Mark Mancini
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
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?
Hand warmers work through simple chemistry. A massively sped-up version of oxidation (the chemical reaction that makes rust) is to thank.
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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?
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.
By Mark Mancini
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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?
A new geometric shape called the "einstein" shape has been discovered and when you tile it, no repeating pattern emerges.
Math is a language of symbols and equations and knowing the basic signposts is the first step in solving mathematical problems.
It's seeped into movies and popular culture, but what does "six degrees of separation" really mean? Are we really that connected to each other?
By Dave Roos
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Metallurgy involves studying how metals behave and using that understanding to manipulate and shape them into various forms.
If you're already familiar with subtracting fractions, learning how to add fractions will be a piece of cake for you. And if you haven't learned how to subtract fractions yet, don't worry - we've got you covered!
It looks completely impossible that this rock should stand, balanced as it is, but it has not moved since the last ice age.
How large does a random group of people have to be for a 50 percent chance to exist that at least two of the people will share a birthday?
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A perfect square is a number, but it can also be explained using an actual square.
Real numbers are the opposite of imaginary numbers and include every number you can think of.