How many red blood cells does the body make per second?
2,000,000. In the minute it takes to read a few of these questions you quietly made 120 million of them.
How close would your guess have been?
In the game we ask it like this: “How many new red blood cells does your bone marrow build every second?”
Type a number — scored exactly the way a round in the game is.
The answer
2,000,000



