In the 1990s, NIST researchers and their colleagues created a high-tech “ruler” known as a frequency comb. Today, the frequency comb is used for medical diagnos

In the 1990s, NIST researchers and their colleagues created a high-tech “ruler” known as a frequency comb. Today, the frequency comb is used for medical diagnostics and more. It’s one of many examples of NIST’s research making a big impact. Learn more: [↧](https://t.co/rO…