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Two very popular and common objects have the same function, but one has thousands of moving parts, while the other has absolutely no moving parts - an hourglass and a sundial.

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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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