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Did you know?

The average office desk has 400 times more bacteria on it than a toilet.

Did you know?

The horizontal fraction bar was introduced by the Arabs.

Did you know?

There are more bacteria in your mouth than there are people in the world.

Did you know?

Hyperthyroidism leads to an increased rate of metabolism and affects about 1% of women but only 0.1% of men. For most people, this increased metabolic rate causes the thyroid gland to become enlarged (known as a goiter).

Did you know?

Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.

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Video: Embryonic development - Weeks 5 to 8

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