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Last Updated: Oct 23, 2019
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Deep heat
Sun rays can burn even through thick glass, and under water. Up to 35% of UVB rays and 85% of UVA rays penetrate thick glass, while 50% of UVB rays and 75% of UVA rays penetrate a meter of water and wet cotton clothing.
Which means you’ll need sunscreen while driving your car on holiday, and water resistant block if you’re swimming.