Natural History, the study of natural objects and events. The term was once applied to the branch of knowledge that includes the biological and physical sciences. In the first century A.D., Pliny the Elder, a Roman writer, summarized most of the existing knowledge of nature in his Historia Naturalis (Natural History). Until the late 19th century many scientific works, especially in the fields of botany and zoology, were called natural histories.
Do you remember what it was like to feel that happy as a kid, when life was less complicated? If not, these 10 tips might get you grinning again. C'mon. Turn that frown upside down.
The human body is composed of about 10 trillion cells. Everything from reproduction to infections to repairing a broken bone happens down at the cellular level. Find out all about cells.