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03/03/2023
The mouth produces about one liter of saliva each day. The human brain may be more active during sleep than when awake. The navel of an average person may contain about 67 different types of bacteria. A person loses about four kilograms of skin cells every year. A person cannot shed tears before he reaches one month of age. The left lung is about 10% smaller than the right lung.
03/03/2023