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.
Did you know?
Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.
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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.
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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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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
The life cycle of HIV
Mastering Bio - Life Cycle of Mosses
jellyfish life cycle
Summary of the Krebs cycle.
Life cycle of a conifer (pine)
Life cycle of a Plasmodium species that causes malaria