★★★★★
First detection of gravitational waves
The LIGO detectors record gravitational waves from two merging black holes, confirming a prediction of general relativity; the result is announced in February 2016.
Science· United States
- 2015
- 1960★★★★★
OPEC founded
Iran, Iraq, Kuwait, Saudi Arabia and Venezuela found the Organization of the Petroleum Exporting Countries at the Baghdad Conference.
Economy· Iraq, Iran, Kuwait, Saudi Arabia, Venezuela