4steps from the big bang
118things can go into it
circuit board
ComponentPart
The flat board that connects a device's parts with thin copper tracks.
First appeared1936 (90 yrs ago)
The flat board that connects a device's parts with thin copper tracks.
The flat board that connects a device's parts with thin copper tracks.
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.