9.5K views · 45 reactions | Atomic clocks record time using microwaves, they are the basis upon which a second is defined. But there’s a new kid on the block, the optical clock, which boasts an even higher level of accuracy. Is it time to redefine the second? Read more: https://www.newscientist.com/article/mg26635372-500-the-epic-quest-to-redefine-the-second-using-the-worlds-best-clocks/ | New Scientist | Facebook