The largest muscle is the


The largest muscle in the human body is the gluteus maximus–your rear end.

The longest bone in the

femurThe longest bone in the body is the femur; the smallest is the stapes.

Babies are born with more

babyBabies are born with more than 270 bones; many fuse together as children get older.

The largest known gallstone weighed

gallstonesThe largest known gallstone weighed more than about 13 pounds and was removed from an 80-year-old woman.

The polar bear’s liver could

polar bearThe polar bear’s liver could kill a human being if eaten because of the lethal amount of vitamin A.

Allergies are the sixth leading

allergensAllergies are the sixth leading cause of chronic disease in the United States.

Approximately 10 million Americans are

cat hairsApproximately 10 million Americans are allergic to cat dander, the most common pet allergy.

There are one billion red

red blood cellsThere are one billion red blood cells in two to three drops of blood.

A newborn only has about

babyA newborn only has about a cup of blood.

Blood travels 60,000 miles per

capillaryBlood travels 60,000 miles per day throughout the body.