原文已被隐藏，你可用 快捷键 - 或点击 显示原文 按钮来查看原文
第1段
1 .This is Scientific American's 60-Second Science. I'm Karen Hopkin. This'll just take a minute.
该句暂无译文！
2 .Sometimes it's hard to see the light.
该句暂无译文！
3 .Especially if it lies outside the visible spectrum, like x-rays or ultraviolet radiation.
该句暂无译文！
4 .But if you long to see the unseeable, you might be interested to hear that under certain conditions people can catch a glimpse of usually invisible infrared light.
该句暂无译文！
5 .That's according to a study in the Proceedings of the National Academy of Sciences.
该句暂无译文！
6 .Our eyes are sensitive to elementary particles called photons that have sufficient energy to excite light-sensitive receptor proteins in our retinas.
该句暂无译文！
7 .The photons in infrared radiation on the other hand have less oomph.
该句暂无译文！
8 .We can detect those lower energy photons using what are sometimes called night-vision cameras or goggles.
该句暂无译文！
9 .But the naked eye is usually blind to infrared radiation.
该句暂无译文！
10 .But recently researchers in a laser lab noticed that they sometimes saw flashes of light while working with devices that emitted brief infrared pulses.
该句暂无译文！
11 .So they filled a test tube with retinal cells and zapped it with their lasers.
该句暂无译文！
12 .When the light pulses rapidly enough, the receptors can get hit with two photons at the same time which supplies enough energy to excite the receptor.
该句暂无译文！
13 .That double dose makes the infrared visible.
该句暂无译文！
14 .One application of the finding is that it could give doctors a new tool to diagnose diseases of the retina.
该句暂无译文！
15 .So they could eyeball trouble before it might otherwise be seen.
该句暂无译文！
16 .Thanks for the minute, for Scientific American's 60-Second Science. I'm Karen Hopkin.
该句暂无译文！