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Did you know?

Looking at the sun may not only cause headache and distort your vision temporarily, but it can also cause permanent eye damage. Any exposure to sunlight adds to the cumulative effects of ultraviolet (UV) radiation on your eyes. UV exposure has been linked to eye disorders such as macular degeneration, solar retinitis, and corneal dystrophies.

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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.

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The first successful kidney transplant was performed in 1954 and occurred in Boston. A kidney from an identical twin was transplanted into his dying brother's body and was not rejected because it did not appear foreign to his body.

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The oldest recorded age was 122. Madame Jeanne Calment was born in France in 1875 and died in 1997. She was a vegetarian and loved olive oil, port wine, and chocolate.

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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.

(A) The structure of a neuron, showing the dendrites, nerve cell body, and axon. (B) Photomicrograph (A) The structure of a neuron, showing the dendrites, nerve cell body, and axon. (B) Photomicrograph
Living systems such as the human body consist of closely interrelated elements Living systems such as the human body consist of closely interrelated elements
Major Muscles of the Body Major Muscles of the Body
Integumentary regulation of body temperature. Integumentary regulation of body temperature.
Two Cnidarian Body Plans Two Cnidarian Body Plans
Alcohol metabolism Alcohol metabolism
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