33
/
AIzaSyB4mHJ5NPEv-XzF7P6NDYXjlkCWaeKw5bc
November 30, 2025
1928191
159213
2
Public Timelines
FAQ

jul 31, 1886 - Marie and Pierre Curie discovered radium and polonium, and discovered beta particles are negatively charged.

Added to timeline:

Date:

jul 31, 1886
Now
~ 139 years ago