|
|
Did you know?
Vaccines prevent between 2.5 and 4 million deaths every year.
Did you know?
Only 12 hours after an egg cell is fertilized by a sperm cell, the egg cell starts to divide. As it continues to divide, it moves along the fallopian tube toward the uterus at about 1 inch per day.
Did you know?
The average adult has about 21 square feet of skin.
Did you know?
It is difficult to obtain enough calcium without consuming milk or other dairy foods.
Did you know?
The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.