Tenith Adithyaa, a teenager from India, used UV to make the leaves stay fresh for a year.

来自印度的青少年 Tenith Adithyaa 利用紫外线使这些叶子保持新鲜一年。

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A team of physicists in the us has created an infrared laser beam at a point in mid air, by focusing a UV laser onto a tiny volume of oxygen molecules.

美国的一个物理学家团队通过将一束紫外激光聚焦于一小块氧分子中，发明了一种聚焦于半空中一点的红外激光束。

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Although more than 30 states already have legislation to better regulate indoor tanning, doctors think a federal standard is needed, especially since artificial UV light is a known carcinogen.

虽然为了更好地控制室内晒黑，30多个州已经立法，但医生们认为一个全国性的标准是必要的，特别是鉴于人工紫外线是众所周知的致癌物质。

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's Avaira and ClearSight product lines meet Class 2 standards, in which 70% of UV-A and 95% of UV-B is blocked.

WSJ: Contacts Lenses That Let In Sun, But Block UV Rays

Some Class 2 lenses beat the standard: Avaira, for example, block at least 75% of UV-A radiation and 99% of UV-B radiation, according to the package insert.

WSJ: Contacts Lenses That Let In Sun, But Block UV Rays

Only a limited number meet Food and Drug Administration standards for "Class 1" protection, in which 90% of UV-A radiation is blocked and 99% of UV-B radiation is blocked.

WSJ: Contacts Lenses That Let In Sun, But Block UV Rays