« previous next »
« previous next »
 

Did you know?

Of the estimated 2 million heroin users in the United States, 600,000–800,000 are considered hardcore addicts. Heroin addiction is considered to be one of the hardest addictions to recover from.

Did you know?

Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.

Did you know?

Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.

Did you know?

The average office desk has 400 times more bacteria on it than a toilet.

Did you know?

Pope Sylvester II tried to introduce Arabic numbers into Europe between the years 999 and 1003, but their use did not catch on for a few more centuries, and Roman numerals continued to be the primary number system.

Extent of agricultural activity across the planet (data from Foley et al. 2005). Extent of agricultural activity across the planet (data from Foley et al. 2005).
Recognizing data clusters Recognizing data clusters
A Sense of Ethnicity A Sense of Ethnicity
Chi-Square Analysis of Mendel's Data Chi-Square Analysis of Mendel's Data
Histograms - Analysis and Data Histograms - Analysis and Data
Satellite data on primary productivity in the equatorial Pacific Ocean Satellite data on primary productivity in the equatorial Pacific Ocean
Video: Cardiac Cycle (Part 2 of 4)

For a complete list of videos, visit our video library