American painter Winslow Homer, known for his watercolors exploring the relationship between humans and nature, was born in Boston #OnThisDay in 1836.

Winslow Homer | American artist
These 10 events were some of the defining moments in the ongoing struggle for civil rights in the United States. #BlackHistoryMonth

10 Milestones in U.S. Civil Rights History
#OnThisDay in 1942 The Voice of America made its first broadcast, in German, to counter the propaganda of Nazi leaders. By the time World War II ended, the VOA was broadcasting 3,200 programs in 40 languages every week.

Voice of America (VOA) | United States radio network
The terms "herbs" and "spices" are often used interchangeably but they are in fact two distinct types of seasonings.

What’s the Difference Between an Herb and a Spice?
On this day in 1868, the U.S. House of Representatives voted 126–47 to impeach President Andrew Johnson, whose lenient Reconstruction policies regarding the South after the Civil War angered Radical Republicans in Congress.

Andrew Johnson | president of United States
#OnThisDay in 1878 Russian avant-garde painter, Kazimir Malevich, who was the founder of the Suprematist school of abstract painting, was born.

Kazimir Malevich | Russian painter
Mexican-born American musician Carlos Santana won eight Grammy Awards for Supernatural , tying the record set by Michael Jackson, #OnThisDay in 2000.

Carlos Santana | American musician
The term "gaslighting" is appearing more frequently in cultural discussions, but what does it mean and how does it actually work?

What Is Gaslighting?
Born #OnThisDay in 1868, W. E. B. Du Bois is largely considered to be the most important black protest leader in the U.S. in the first half of the 20th century. He helped found the NAACP in 1909 and pioneered advocacy of Pan-Africanism, the belief that all people of African descent had common interests and should work together in the struggle for their freedom. #BlackHistoryMonth

W. E. B. Du Bois | American sociologist and social reformer
Ancient geoglyphs, or artificial landscapes in geometric designs, have been discovered deep in the Amazon rainforest.
#OnThisDay in 1836, during the Texas war for independence, Mexican General Antonio López de Santa Anna began a siege of the Alamo, which was captured after 13 days and which became for Texans a symbol of heroic resistance.

Alamo | monument, San Antonio, Texas, United States
#OnThisDay in 1847 U.S. General Zachary Taylor led troops against a Mexican force commanded by General Antonio López de Santa Anna at the Battle of Buena Vista.

Battle of Buena Vista | Mexican-American War [1847]
NASA announced the discovery of 7 Earth-sized planets orbiting the TRAPPIST-1 star, almost 40 light years away. Three of those planets have orbits within the habitable zone, meaning liquid water may be on the planets' surfaces.

New System May Have Three Habitable Planets
Did You Know: The study of extremophiles -- organisms that not only tolerate extreme environmental conditions, but have also adapted to thrive in them -- are important to astrobiology, since extraterrestrial environments may favour life-forms that use or are built from elements not typically found in life on Earth.

extremophile | biology
How does a species become endangered and who makes that call? #WildlifeWednesday

What Makes a Species Endangered?
After enduring more than five months of tremors, Christchurch, New Zealand, and its surrounding area were struck by a massive destructive aftershock (magnitude 6.3) #onthisday in 2011.

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Guion "Guy" Bluford became the first African American astronaut in space in 1983. He was one of 35 individuals selected from 10,000 candidates entering NASA's first competition to become space shuttle astronauts. He subsequently flew three more missions between 1985 and 1992, and was a mission specialist for all four flights. #BlackHistoryMonth.

Guion Bluford | American astronaut
Fun Fact: Extrasolar planets are also known as #exoplanets. They are any planetary bodies that exist outside our known solar system and orbit a star other than Earth's sun. There are currently 3,000 confirmed extrasolar planets with at least a thousand more awaiting confirmation.

extrasolar planet | astronomy
Evidence suggests a type of salmonella bacteria may have triggered one of the epidemics that contributed to the fall of the Aztec empire.

Collapse of Aztec Empire Linked to Epidemics of Enteric Fever
On this day in 1997, a team of British scientists working under the direction of Ian Wilmut at the Roslin Institute near Edinburgh announced the birth of Dolly the sheep, the first clone of an adult mammal. [ Link ]