From sunburns to skin cancer, there are many ways the sun’s rays can hurt you. Understanding how sunscreen works can help you protect yourself properly.

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How can we learn about the galaxies beyond our own? It all begins with light - the kind we see and the kind we can’t. (4:45 min.)

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You generally get vitamins from food. Vitamin D, however, can also be synthesized in the skin from sunlight!

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