GCSE Physics - Visible and UV Light #67
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4:07
GCSE Physics - X-Rays and Gamma Rays #68
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11:13
The World in UV
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4:49
GCSE Physics - Microwaves and Infrared #66
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14:49
The Horrors of UV radiation
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5:27
A Sad Moment in American History
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6:30
GCSE Physics - How Lenses Work #69
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6:51
Amazon change la façon dont vous possédez vos livres Kindle - vous avez 10 jours pour réagir
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6:49