Quest GiggleHow many nephrons are in a human kidney?
1,000,000. A fist-sized organ does all that filtering with no moving parts and no off switch.
How close would your guess have been?
In the game we ask it like this: “About how many microscopic filters are packed into one human kidney?”
Type a number — scored exactly the way a round in the game is.
The answer
1,000,000
