2005: The 6.8 Mw Lake Tanganyika earthquake shakes the eastern provinces of the Democratic Republic of the Congo with a maximum Mercalli intensity of X (Extreme), killing six people.
2004: The Civil Partnership Act comes into effect in the United Kingdom, and the first civil partnership is registered there.
1983: Dissolution of the Military Junta in Argentina.
1977: Egypt breaks diplomatic relations with Syria, Libya, Algeria, Iraq and South Yemen. The move is in retaliation for the Declaration of Tripoli against Egypt.
1964: Lloyd J. Old discovered the first linkage between the major histocompatibility complex (MHC) and disease—mouse leukemia—opening the way for the recognition of the importance of the MHC in the immune response.
1958: The Preston By-pass, the UK's first stretch of motorway, opens to traffic for the first time. (It is now part of the M6 and M55 motorways.)
1958: Subscriber Trunk Dialling (STD) is inaugurated in the United Kingdom by Queen Elizabeth II when she speaks to the Lord Provost in a call from Bristol to Edinburgh.