The Challenge: Make Sunblock
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Why does our skin get sunburned?
Sunburn is a little
different than tanning. Sunburn, also called erythema, is cellular damage
from the sun. UVB is responsible for most cases of sunburn and skin cancers.
The outer layers of the skin absorb its shorter wavelengths and cause
them to burn without stimulating much tanning, The photochemical reaction
causes increased blood flow to the capillaries of your skin. Redness is
caused by the extra blood flow. When you press on the sunburned skin, it
becomes white until the capillaries refill.
How can we protect our skin?