In 1912 Alfred
Wegener proposed a controversial theory about how the Earth’s land masses
formed. He said the great continents had once formed a single landmass, which
had broken up over time. The idea went against all conventional ideas, and was
It took the
work of young cartographer Marie Tharp to prove him right.
In 1947, she
worked on a team that were running expeditions around the world, mapping the
ocean floors with echolocation. However, Marie wasn’t allowed on the missions because
women were seen as ‘bad luck’…
But the work
she did back at the university was invaluable. Converting endless data into
detailed profiles, she realised that the ocean floor isn’t a flat, featureless
plane, but a complex, varied landscape.
importantly, she spotted a long, V-shaped valley in each of her profiles: a
rift valley that supported Wegener’s theory, formed by two land masses moving
apart, splitting the ocean floor in two.
But even with
this evidence, Tharp’s ideas were dismissed as ‘girl talk’.
realised that her profiles tied in with worldwide earthquake maps being
developed by a colleague.
evidence started to convince some sceptics, but not all. Renowned explorer
Jacques Cousteau was so unconvinced that he sent an expedition to film the
ocean floor and clear things up once and for all. What did his footage show?
Exactly what Tharp had predicted.
steadfast determination had paved the way for Wegener’s continental drift
theory to gain traction. As the tide of opposition waned, it gave birth
to our modern understanding of plate tectonics and secured Tharp’s
position as one of the most outstanding cartographers of the 20th century.
On this day but in 1750, Caroline Lucretia Herschel was born.
Caroline Herschel was the sister of the astronomer William Herschel. After learning astronomy alone and math with the help of her brother, she became his assistant. His most significant contribution to astronomy were the discoveries of various comets, especially comet 35P / Herschel-Rigollet.
“I have as much muscle as any man and can do as much work as any man. I have plowed and reaped and husked and chopped and mowed and can any man do more than that?” -Sojourner Truth
Today marks the beginning of Black History Month, or National African American History Month, an annual celebration of achievements by black Americans and a time for recognizing the central role of African Americans in U.S. history.
We are beginning by honoring Sojourner Truth, an American abolitionist and women’s rights activist who escaped slavery with her infant daughter in 1826. In 1828, she went to court to get back her son, who had been illegally sold into slavery at the age of 5. She became one of the first black women to go to court against a white man and win the case.