History of iron and early steel
History of iron: a Greek black-figure vase showing a blacksmith at work (Athens, about 550 BC) Why do people use iron? The history of iron doesn't start until much later [...]
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09, 2017
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09, 2017
What is lead? A heavy kind of metal
History of lead: A Roman anchor from Palermo, Italy What did ancient people use lead for? Lead is a kind of metal that is very heavy. (See if you can get some lead, [...]
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09, 2017
History of engineering – transportation, cooking, metal
A Neanderthal stone awl People have been using engineering to solve the problems of their daily lives since the first caveman picked up a rock and chipped away at it to make a handaxe. [...]
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08, 2017
What is electricity? Physics
What is electricity? A bolt of lightning in the sky What is electricity made of? Everything in the universe is made of atoms. Those atoms are made of electricity. Atoms are [...]
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06, 2017
What is rust? Oxidation reactions and chemistry
What is rust? A rusty fence railing Oxidation reactions Fire isn't the only kind of combustion reaction. Some kinds of metal, if you leave them in contact with oxygen, will [...]
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06, 2017
What is metal? Chemistry
Copper ore in Iran What is metal? Metals are atoms that attach themselves to other atoms in a particular way. Metal atoms, because of how their electrons are arranged, lose [...]
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06, 2017
Metal project – Chemistry Activity
Bending a nail You can do an experiment to see that metal bends easily. Just take an iron nail and hit it with a hammer and if you don't hit it [...]
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06, 2017
What is tin? Atoms, elements, chemistry
Like the other metals, tin is one of the heavier kinds of atoms. Every atom of tin has 50 protons and 69 neutrons in its nucleus (depending on the isotope; the exact [...]
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06, 2017
Lead fishing weights – Science project
Lead weights used for fishing How heavy is lead? See for yourself how heavy lead weights are. Go to a sports store and get some small lead fishing weights (make sure [...]
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06, 2017
Rust and iron – Chemistry project
A rusty sign You can easily see that iron rusts and turns red when oxygen touches it. Go look around your backyard or your neighborhood and try to find ten things [...]
