« previous next »
« previous next »
 

Did you know?

No drugs are available to relieve parathyroid disease. Parathyroid disease is caused by a parathyroid tumor, and it needs to be removed by surgery.

Did you know?

Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.

Did you know?

Chronic necrotizing aspergillosis has a slowly progressive process that, unlike invasive aspergillosis, does not spread to other organ systems or the blood vessels. It most often affects middle-aged and elderly individuals, spreading to surrounding tissue in the lungs. The disease often does not respond to conventionally successful treatments, and requires individualized therapies in order to keep it from becoming life-threatening.

Did you know?

Certain chemicals, after ingestion, can be converted by the body into cyanide. Most of these chemicals have been removed from the market, but some old nail polish remover, solvents, and plastics manufacturing solutions can contain these substances.

Did you know?

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

The Mass of Impacts on Earth The Mass of Impacts on Earth
World Population Growth, Past 10,000 years World Population Growth, Past 10,000 years
Jet streams and Earth’s heat budget Jet streams and Earth’s heat budget
Pangaea 200 Million Years Ago Pangaea 200 Million Years Ago
Earth’s Oldest Preserved Rocks – 3.8 Billion Years Old, Greenland Earth’s Oldest Preserved Rocks – 3.8 Billion Years Old, Greenland
Earth 600 Million Years Ago Earth 600 Million Years Ago
Video: Skin Cancer

For a complete list of videos, visit our video library