« previous next »
« previous next »
 

Did you know?

Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.

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?

When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.

Did you know?

According to research, pregnant women tend to eat more if carrying a baby boy. Male fetuses may secrete a chemical that stimulates their mothers to step up her energy intake.

Did you know?

In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.

The Passenger Pigeon—a Recent Extinction Example The Passenger Pigeon—a Recent Extinction Example
Risk of death from motorcycle accidents (dashed lines) and passenger accidents (solid lines) per 100 Risk of death from motorcycle accidents (dashed lines) and passenger accidents (solid lines) per 100
Top Prescriptions for Children Under 17 Years of Age (2002–2010) Top Prescriptions for Children Under 17 Years of Age (2002–2010)
Passenger Space Oddity (David Bowie Cover) Passenger Space Oddity (David Bowie Cover)
An organizational specialist is hired as a consultant to a company planning to open a coffee ... An organizational specialist is hired as a consultant to a company planning to open a coffee ...
An organizational specialist is hired as a consultant to a company planning to open a coffee ... An organizational specialist is hired as a consultant to a company planning to open a coffee ...
Video: Chemical Equilibrium between N2O4 (colorless gas) and NO2 (brown gas)

For a complete list of videos, visit our video library