« previous next »
« previous next »
 

Did you know?

The familiar sounds of your heart are made by the heart's valves as they open and close.

Did you know?

In 1864, the first barbiturate (barbituric acid) was synthesized.

Did you know?

There used to be a metric calendar, as well as metric clocks. The metric calendar, or "French Republican Calendar" divided the year into 12 months, but each month was divided into three 10-day weeks. Each day had 10 decimal hours. Each hour had 100 decimal minutes. Due to lack of popularity, the metric clocks and calendars were ended in 1795, three years after they had been first marketed.

Did you know?

Eating carrots will improve your eyesight. Carrots are high in vitamin A (retinol), which is essential for good vision. It can also be found in milk, cheese, egg yolks, and liver.

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.

Amazing NASA Pictures Collection Amazing NASA Pictures Collection
Amazing NASA Pictures Collection Amazing NASA Pictures Collection
Amazing NASA Pictures Collection Amazing NASA Pictures Collection
Amazing NASA Pictures Collection Amazing NASA Pictures Collection
Methods of Contraception Methods of Contraception
Venipuncture equipment. Venipuncture equipment.
Video: Oxygen - hemoglobin dissociation curve & Hemoglobin's affinity with oxygen - acidity

For a complete list of videos, visit our video library