In the late 19th century, millions of human mummies were used as fuel for locomotives in Egypt where wood and coal was scarce, but mummies were plentiful. Jaw muscles can provide about 200 pounds of force to bring the back teeth together for chewing. Lab tests can detect traces of alcohol in urine six to 12 hours after a person has stopped drinking. Laughing lowers levels of stress hormones and strengthens the immune system. Adults only laugh 15 to 100 times a day.
Most men have erections every hour to hour and a half during sleep.
The ashes of the average cremated person weigh nine pounds. The average duration of sexual intercourse for humans is 2 minutes. The average human produces 25,000 quarts of spit in a lifetime, enough to fill two swimming pools. The average person releases nearly a pint of intestinal gas by flatulence every day. Most is due to swallowed air.