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Why Ice Floats

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Why Ice Floats
The emotions that you feel are a result of chemical messengers, primarily neurotransmitters. Love, jealousy, envy, infatuation and infidelity all share a basis in chemistry.
Why Onions Make You Cry

Marcelo Brito Filho
They sit there, so harmless-looking on the kitchen counter. Yet as soon as you cut an onion, the tears begin to fall. What is it in onions that makes them burn your eyes?
Why Ice Floats

Thomas Northcut, Getty Images
Can you imagine how different the world around you would be if ice sank? For one thing, lakes would freeze from the bottom. Chemistry holds the explanation for why ice floats, while most substances sink when they freeze.
How Soap Cleans

Sean Justice, Getty Images
Soap is a chemical that mankind has been
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