Why is the sky blue? Weather science
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 [...]
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08, 2017
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08, 2017
How old is the Earth? – Astronomy
Earth from space: How old is the Earth? When did the Earth form? Like Mercury and Venus and the other planets that go around the Sun, the Earth probably formed a little more than four and a [...]
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08, 2017
What makes sound? Simple physics
Playing a French horn makes sounds because you blow into it and that moves the air Like light, sound travels through the air in waves, but unlike light, sound is not [...]
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08, 2017
European science in the 1800s
European boys at school in the 1800s More schools and more scientists In the first half of the 1800s AD, countries in northern Europe like France and Britain forced other countries to give them [...]
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07, 2017
What is a hexagon? Simple geometry
This is a hexagon. See, it has six sides that are all the same length. Definition of a hexagon A hexagon is a flat shape, all in one plane, with six [...]
2
06, 2017
What is plastic? Organic chemistry
Plastic water bottles There are thousands of different kinds of plastic, from shopping bags to Fisher-Price toys to photographic film, CD's, and plumbing pipes. Some plastics, like chewing gum or [...]
2
06, 2017
Organic chemistry
A diagram of a sugar molecule found in outer space, from NASA Organic molecules means the kind of molecules that living things are made of - at least, all the [...]
2
06, 2017
What are amino acids? Organic chemistry
A model of the amino acid molecule glycine (red is oxygen, black is carbon, yellow is hydrogen, and blue is nitrogen atoms) What are amino acids? Amino acids are molecules made [...]
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06, 2017
What is water made of? Molecules and chemistry
A big ocean wave The first molecules of water formed out in space, about 14 billion years ago, as part of the nebula left over after an early star exploded [...]
2
06, 2017
Molecules – Simple science – Chemistry
Protein molecules - each dot is one molecule. What is a molecule? A molecule is a group of two or more atoms that stick together. Molecules (MOLL-uh-cyools) are so small [...]
