acm-header
Sign In

Communications of the ACM

ACM News

The Quest to Perfect the ­niversal Language of Science


Kibble balance

This machine, known as the Kibble balance, will help physicists re-define the kilogram to parts per billion.

Credit: J. L. Lee/NIST

For millennia, humans have turned to the sky to tell time.

From Wired
View Full Article


 

No entries found

Sign In for Full Access
» Forgot Password? » Create an ACM Web Account