The Challenge: Make Sunblock
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How does our skin become tanned?
Tanning shows the reaction of our skin in defending itself against harmful rays from the
sun. UVA light stimulates melanin production and tanning due to its
ability to penetrate into deep layers of the skin. The melanin in our
skin, produced by melanocytes, is a chemical pigment that absorbs UV rays,
thus limiting the penetration into the skin tissues. The cells that are
hit by radiation are colored as they move to the surface. When pigmentation
disappears, the cells have died. Some people naturally have more melanin
in their skin, which protects them a little better than those without
How does our skin get sunburned?