Announcement: the Curiosity Podcast is finally here! Subscribe on iTunes here, Google Play Music here and add the RSS feed to your favorite podcast player. If you love it please consider leaving us a review.
Share the knowledge!
Key Facts In This Video
In 1899, the International Bureau of Weights and Measures created an iridium cylinder as the worldwide standard for the kilogram. 00:32
30 years ago, scientists realized that the masses of the original kilogram and its copies are drifting apart. Nobody knows why. 01:03
The BIPM has already redefined other measures using universal constants. A meter, for example, is the distance light travels in 1/299,792,458 of a second. 01:39