« previous next »
« previous next »
 

Did you know?

In ancient Rome, many of the richer people in the population had lead-induced gout. The reason for this is unclear. Lead poisoning has also been linked to madness.

Did you know?

More than 50% of American adults have oral herpes, which is commonly known as "cold sores" or "fever blisters." The herpes virus can be active on the skin surface without showing any signs or causing any symptoms.

Did you know?

Adult head lice are gray, about ? inch long, and often have a tiny dot on their backs. A female can lay between 50 and 150 eggs within the several weeks that she is alive. They feed on human blood.

Did you know?

You should not take more than 1,000 mg of vitamin E per day. Doses above this amount increase the risk of bleeding problems that can lead to a stroke.

Did you know?

Children of people with alcoholism are more inclined to drink alcohol or use hard drugs. In fact, they are 400 times more likely to use hard drugs than those who do not have a family history of alcohol addiction.

Invasive species provide an example of predator pressure. Invasive species provide an example of predator pressure.
Large size can provide a refuge from predators. While young African elephants may be vulnerable to p Large size can provide a refuge from predators. While young African elephants may be vulnerable to p
The Krapina remains may provide evidence of cannibalism by some Neadertals. The Krapina remains may provide evidence of cannibalism by some Neadertals.
Trees provide ecosystem services to people Trees provide ecosystem services to people
The Many Sizes of Soft Drinks A bottle or can of soda can provide from 6 to 17 teaspoons of added The Many Sizes of Soft Drinks A bottle or can of soda can provide from 6 to 17 teaspoons of added
Growing plants in a container garden can provide healthy, nutritious vegetables for your dinner Growing plants in a container garden can provide healthy, nutritious vegetables for your dinner
Video: Acids and bases - definition

For a complete list of videos, visit our video library