Human Body

Give a tennis ball a good, hard squeeze. You're using about the same amount of force your heart uses to pump blood out to the body.

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Amazing (200) America (274) Animal (433) Best (18) Engineering (13) English Language (23) Famous (20) Fun (34) Great (42) Highest (28) Human Body (2,500) Interesting (2,332) Largest (100) Least (24)

Longest (39) Lowest (6) Math (18) Most (119) Nature (13) Oldest (20) Popular (45) Random (452) Real (886) Science (21) Smallest (16) Sports (76) Time (15) World War II (61)

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