When spring's light comes, the melatonin diminishes, and suddenly we are awakened to the dusty, virus-filled house we've been hibernating in for four months.

当春天的阳光来临时，褪黑激素减少了，突然间我们被唤醒，回到了我们冬眠了四个月、布满灰尘、病毒的房子。

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Cherenkov light comes from these particles when the speed of light is exceeded.

切伦科夫光来自光速被超过时的这些粒子。

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It's like the cold that comes when there is no heat or the darkness that comes when there is no light.

这就好像当没有热量时寒冷就会来临，当没有光时黑暗就会来临。

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The laser light dims within seconds when the plastic comes into contact with even the tiniest emission of vapour.

BBC: Plastic lasers shed light on hidden explosives

"Einstein's theory of general relativity tells us that mass bends space and time, so when light comes toward us through the Universe, if it passes some dark matter, its light gets bent and the image we see gets bent and distorted, " Dr Heymans told the meeting.

BBC: Dark matter hints in widest-yet view of dark mystery

When it comes to light, the company that commissioned it is usually deeply embarrassed, and tries to disown the investigators it has employed.

BBC: I spy with my private eye.....