The size of your fist.
the average mans humerous is a bone in his arm
Average 7-8 hrs
adults average around 30 inches
The average is 8 hours a night that you should be getting!!
The pH of the mouth is very variable; sometimes 5,5-6,0. however, on an average basis, it is 7, or neutral.
The average rate of listening efficiency for most adults is 25%
Adults average 2 to 3 ft long, and weigh 10 to 45 pounds. The record was 110 pounds and 5 ft long.
450-500
2cm
The average breathing rate of adults during exercise is 40 to 50 breath per minute.
Around 90-110 minutes for adults and in children it's about 45 minutes.
i think it is because kids and adults used to play with a pig stomach!!