« previous next »
« previous next »
 

Did you know?

Only 12 hours after an egg cell is fertilized by a sperm cell, the egg cell starts to divide. As it continues to divide, it moves along the fallopian tube toward the uterus at about 1 inch per day.

Did you know?

Astigmatism is the most common vision problem. It may accompany nearsightedness or farsightedness. It is usually caused by an irregularly shaped cornea, but sometimes it is the result of an irregularly shaped lens. Either type can be corrected by eyeglasses, contact lenses, or refractive surgery.

Did you know?

There are more nerve cells in one human brain than there are stars in the Milky Way.

Did you know?

Hip fractures are the most serious consequences of osteoporosis. The incidence of hip fractures increases with each decade among patients in their 60s to patients in their 90s for both women and men of all populations. Men and women older than 80 years of age show the highest incidence of hip fractures.

Did you know?

It is believed that humans initially contracted crabs from gorillas about 3 million years ago from either sleeping in gorilla nests or eating the apes.

Structure of the Early Universe Structure of the Early Universe
Play in Four Cultures Across cultures, play is the most common activity in early childhood. Source: Play in Four Cultures Across cultures, play is the most common activity in early childhood. Source:
Base pairing between pre-mRNA, U1 snRNA, and U2 snRNA early in the splicing proc Base pairing between pre-mRNA, U1 snRNA, and U2 snRNA early in the splicing proc
Signs and Symptoms of Infection and Inflammation Signs and Symptoms of Infection and Inflammation
Signs and Symptoms of Shock Following a Crisis Situation Signs and Symptoms of Shock Following a Crisis Situation
Early Amphibians Illustrated Early Amphibians Illustrated
Video: Cardiac Cycle (Part 2 of 4)

For a complete list of videos, visit our video library