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Why is the sky blue? Weather science

By |2017-08-20T23:42:12+00:00August 20th, 2017|Physics|

Blue sky with cirrus clouds This is an easy question to ask but the answer is pretty hard. The light that comes from the Sun to Earth looks white, but really it is made up of all different colors of light mixed together. You can see this by using a glass of water or a glass prism to break up [...]

What’s the atmosphere? Weather science

By |2019-02-05T05:47:27+00:00August 19th, 2017|Physics|

Earth's atmosphere: Did the Earth look like this right after it cooled down? What is the atmosphere? The atmosphere is the air that is wrapped all around a planet. Read more about planets Why is the sky blue? All our physics articles Do all planets have atmospheres? Not all planets have atmospheres. In order [...]

Sharecroppers and cotton – American History

By |2018-04-18T18:43:37+00:00June 8th, 2017|Clothing, North America|

Sharecroppers and cotton: Cotton pickers in the 1800s AD Slavery and the cotton gin The invention of the cotton gin in 1793 AD made it possible for enslaved people to produce cotton cheaply enough so cotton was now the cheapest kind of cloth. Tens of thousands of black people worked hard as slaves [...]

What is nitrogen? Atoms, Elements, Chemistry

By |2018-04-24T14:46:22+00:00June 2nd, 2017|Chemistry|

Diagram of a nitrogen atom Inside a red giant star, the star smashes lighter atoms together. Smashing atoms gets the star energy to burn, and also leaves extra heavier atoms. Nitrogen is one of these heavier atoms, left over when a star smashes together carbon atoms. Nitrogen is not very heavy, though, and a [...]

Plant food – a nitrogen project – Chemistry

By |2018-04-16T17:46:39+00:00June 1st, 2017|Chemistry|

A jug of nitrogen fertilizer It's pretty easy to see just how much a plant needs nitrogen to grow. Just take any two plants (they could be small house plants, or plants growing outside) and sprinkle a nitrogen-based plant food over one of them, and not the other one. Follow the directions on [...]