Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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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.
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In most climates, 8 to 10 glasses of water per day is recommended for adults. The best indicator for adequate fluid intake is frequent, clear urination.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
The wolf spider, Lycosa godeffroyi, is common in many areas of Australia. In this family of spiders,
Motion of Stars at the Poles
Pre–Main-Sequence Stars
Homeless people sleeping on the streets is a common sight in India’s cities. I took this photo in ...