If scientists had sacred objects, this would be one of them: a single, closely guarded 137-year-old cylinder of metal, housed in a vault outside of Paris. It is a prototype that precisely defines a ...

The 50-foot-wide racetrack used to study muons traveled by barge around Florida and up the Mississippi, and then by truck across Illinois. Reidar Hahn, Fermilab About 50 years ago, physicists came up ...

Researchers at Caltech and MIT have developed a theorem, dubbed IT-π, that identifies the most informative variables for predicting outcomes in AI and physics models while removing measurement units.

In the last few weeks I've been working on a slightly more formal version of this post on black-body radiation for use in something else. One of the tricky things in writing about the development of ...

When it comes to measuring things, there are some odd units of measurement out there. While measuring in feet is standard, there are many weirder ways to measure. Did you know a hand is a unit of ...

With a dedicated monthly column, Nature Physics draws attention to metrology. And a set of Commentaries in this issue focuses on various aspects of thermometry. Physics is all about observations, ...