2021-01-27

Arab Spring: The Yemeni Revolution began as more than 16,000 protesters demonstrated in Sanaa to demand governmental changes.

Astronomers documented H1504+65, a white dwarf in Ursa Minor (chart pictured) with the hottest surface temperature known at the time, at 200,000 kelvins (360,000 °F).

Porfirio Lobo Sosa became the new president of Honduras, ending a constitutional crisis that had begun in 2009 when Manuel Zelaya was forcibly removed from office.

The first selections for the United States National Recording Registry were announced by the Library of Congress.

Mahamane Ousmane, the first democratically elected president of Niger, was deposed by Colonel Ibrahim Baré Maïnassara in a military coup d'état.

Six American diplomats who had evaded capture in the Iran hostage crisis escaped with the help of Canadian government officials to Zürich, Switzerland.

A fire during a launch simulation for the Apollo 1 mission at Cape Kennedy killed astronauts Gus Grissom, Ed White and Roger Chaffee.

South Vietnamese prime minister Trần Văn Hương was removed by the military junta of Nguyễn Khánh.

The Soviet Red Army liberated about 7,000 prisoners left behind by the Nazis in Auschwitz concentration camp.

A contaminated diphtheria vaccine was used in an Australian immunisation program, leading to the deaths of twelve children and the suspension of immunisation programs in several countries.