4min chapter

Nature Podcast cover image

Cellular ageing: turning back the clock restores vision in mice

Nature Podcast

CHAPTER

A Number That's Close to Physicists Hearts

The fine structure constant characterizes the strength of one of the four fundamental forces, electromagnetism. Researchers have honed methods to measure it as precisely as possible. The acurasy now is a one par per trillion, 81 parts per trillion. It's equivalent to measuring the distance from london to new york to point four, five millimeters.

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