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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?

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

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The eye muscles are the most active muscles in the whole body. The external muscles that move the eyes are the strongest muscles in the human body for the job they have to do. They are 100 times more powerful than they need to be.

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It is difficult to obtain enough calcium without consuming milk or other dairy foods.

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Children with strabismus (crossed eyes) can be treated. They are not able to outgrow this condition on their own, but with help, it can be more easily corrected at a younger age. It is important for infants to have eye examinations as early as possible in their development and then another at age 2 years.

Layering Clothing in Cold Environments Layering Clothing in Cold Environments
Advection of cold and warm air at different levels. Advection of cold and warm air at different levels.
Acid-Reactive Salts Acid-Reactive Salts
The distribution of high-energy, nutritious biscuits was a lifeline in the first days after the 2010 The distribution of high-energy, nutritious biscuits was a lifeline in the first days after the 2010
A Hydrothermal Vent on the Seafloor A Hydrothermal Vent on the Seafloor
High in the Andes, a scientist measures the stride of a carnivorous dinosaur High in the Andes, a scientist measures the stride of a carnivorous dinosaur
Video: Frequency of stimulation and force (Recruitment of motor units and force)

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