4steps from the big bang
116things can go into it
fridge
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A fridge doesn't make cold. It pumps heat out of the box and lets it out at the back.
First appeared1913 (113 yrs ago)
A fridge doesn't make cold. It pumps heat out of the box and lets it out at the back.
A fridge doesn't make cold. It pumps heat out of the box and lets it out at the back.
The most direct chain from the start of the universe, following what things are made from and, for living things, what they evolved from. Each step shows when it first appeared.