« previous next »
« previous next »
 

Did you know?

Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.

Did you know?

Your heart beats over 36 million times a year.

Did you know?

Hypertension is a silent killer because it is deadly and has no significant early symptoms. The danger from hypertension is the extra load on the heart, which can lead to hypertensive heart disease and kidney damage. This occurs without any major symptoms until the high blood pressure becomes extreme. Regular blood pressure checks are an important method of catching hypertension before it can kill you.

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?

Cutaneous mucormycosis is a rare fungal infection that has been fatal in at least 29% of cases, and in as many as 83% of cases, depending on the patient's health prior to infection. It has occurred often after natural disasters such as tornados, and early treatment is essential.

Relationship between winter rainfall and chuckwalla, Sauromalus, size Relationship between winter rainfall and chuckwalla, Sauromalus, size
The Seasonality Effect The Seasonality Effect
The Flynn Effect The Flynn Effect
Testing the patellar reflex with a percussion hammer. Testing the patellar reflex with a percussion hammer.
Effect of Winds on Horizontal Transport Effect of Winds on Horizontal Transport
Testing Back Pressure with a Pressure Gauge Testing Back Pressure with a Pressure Gauge
Video: Darwin's Observation (Fossils, Galapagos Islands & Africa ) and Natural Selection (Adaptive Traits)

For a complete list of videos, visit our video library