along threads called chromosomes (we humans have forty-six chromosomes, fruit flies have eight)
b1649294135fez uma citaçãohá 5 anos
Even when you look at a friend’s face you are seeing them in the past, because the light from their face takes a tiny fraction of a second to travel to your eye.
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Nowadays, we know that genes – the units of heredity – are made of stuff called DNA.
Nikolai C.fez uma citaçãohá 6 anos
Scientists talk about ‘forces’ and ‘bonds’ and ‘fields’, which act in their different ways both to keep the ‘footballs’ apart and to keep the components of each ‘football’ together. And it is those forces and fields that make things feel solid
Nikolai C.fez uma citaçãohá 6 anos
A group of atoms joined together to make a compound is called a molecule.