RenoVous

  The speed of light is 299,792,458 meters per second. The Slo Mo Guys have a You Tube channel where they've filmed various actions in slow motion, such as firing bullets and getting a tattoo. But they also captured the speed of light, using specialized equipment from CalTech. "We've filmed at some very high frame rates.  We're talking up to about half a million... Their camera puts ours to shame and does ten trillion frames per second." Postdoctoral scholar, Peng Weng, assured them they'd be able to see light moving the length of a bottle. More recently, they posted about how the Nintendo Zapper worked. I can still hear the dog laughing at me.

Cherenkov Light: Electromagnetic radiation emitted when a charged particle passes through a medium at a speed greater than the speed of light within that medium. This is the blue light we see when a nuclear reactor is placed underwater. For years, patients undergoing radiotherapy described seeing a flash of light, and now scientists have obtained photographic proof of its existence. They used a CDose camera which is specially designed to view light emissions from biological systems - "as the radiation beam passes through the eye, light is generated within the vitreous fluid." The researchers believe that this phenomenon can be monitored during therapy to confirm whether the radiation has hit the intended target. IFLScience Nature