1500: Pedro Álvares Cabral is the first european to discover Brazil, landing near Monte Pascoal, claims it for Portugal
1915: 1st military use of poison gas (chlorine, by Germany) in WW I
1993: Holocaust Memorial Museum dedicated in Washington, D.C.
1994: 7,000 Tutsi slaughtered by Hutus in the stadium at Kibuye, Rwanda
2006: 243 people are injured in pro-democracy protest in Nepal after Nepali security forces open fire on protesters against King Gyanendra.
2016: Paris Agreement on climate change signed in New York binding 195 nations to an increase in the global average temperature to less than 2°C above pre-industrial levels and to pursue efforts to limit the increase to 1.5°C