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Did you know?
The horizontal fraction bar was introduced by the Arabs.
Did you know?
In most climates, 8 to 10 glasses of water per day is recommended for adults. The best indicator for adequate fluid intake is frequent, clear urination.
Did you know?
The longest a person has survived after a heart transplant is 24 years.
Did you know?
The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
Did you know?
Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.