In the 17th century, before the stethoscope was invented, anyone in a coma or with a weak heartbeat was presumed dead, and buried.

Experts cannot agree on a single definition for death.

There are three ways a person can die, referred to in official terms as the manner of death, natural death, accidental death, and homicidal death

Natural death is caused by interruption and failure of body functions due to age or disease. This is the least common manner of death.

A homicide is the death of one person caused by a minimum of two of more persons.

In 1932, the F.B.I. announced the opening of its first crime lab. The Smithsonian Institute became a working partner, aiding in the identification of human remains.

Bones originate from living cells called osteoclasts.

During development of the fetus, bones begin as soft cartilage, the same flexible material that makes up the ears. Osteoblasts migrate to the centers of cartilage production and deposit materials, such as calcium phosphate, that harden to form bone.

Bones breathe and consume energy like any other living cells.

Osteoclasts, one type of bone cell, are specialized to create bone.

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