Showing posts with label human evolution. Show all posts
Showing posts with label human evolution. Show all posts

February 24 – Anniversary of The Descent of Man

Posted on February 24, 2015


When asked, “What book did Charles Darwin write?” most people who answered at all would say, “On the Origin of Species.” That was his first book about evolutionary theory, and it made the biggest splash in terms of controversy from scientists and the general public alike.

But although that first book implied that, if modern animals had evolved from simpler forms, humans, too, had evolved from "lower" animals—Darwin had been careful not to explore that concept in Origin. He let it just hang there, in the air: it was implied, not clearly stated.

Actually, Darwin had so little wanted to provoke controversy, he had sat on his unpublished evolutionary theory for 20 years! But in 1859, Origin was published, the word was out, and the firestorm of response began.

Flash forward to this date in 1871. In the 11 years since Origin, plenty of people had discussed and debated and written and published ideas about the evolution of human beings, but now Darwin weighed in on the topic with his book The Descent of Man. Finally Darwin was ready to state that humans, too, had evolved. People had common ancestors with other animals and even plants and mushrooms and protists!

(Remember, Darwin was not the first to claim that humans evolved. But his account of how evolutionary theory applied to humans was an important step in the field.)

A lot of people have made claims about the book The Descent of Man: Darwin was racist, they say, or Darwin wanted to kill off “weaker” humans in favor of the strong. Eugenics—the idea of making the human race better by making the genetic pool better, taller, smarter, stronger, more beautiful, by controlling breeding—is supposed to have gotten its start with Darwin's book.


It is clear that Darwin was a bit racist by today's standards. However, for an Englishman of his own time—a time when many argued that different races were actually different species—Darwin was notable for how minor he thought racial differences were. His book argued, with evidence, that all humans were the same species and shared common ancestors, and pointed out the similarities between all peoples. Also, Darwin was an abolitionist. He first saw slavery in Brazil, while on his famous voyage on the Beagle, and it had horrified him. He thought that “the race question” was one of the most important of his time.

Before Darwin (and unfortunately,
in some cases, even after
Darwin), some people would
have answered this plea, "No,
you're not a man and a brother."
It is also clear that Darwin seemed to think that it was inevitable that less technological people would either die off or be absorbed by what he called “civilised races.” However, he actually argued that people should NOT try to weed out the “weak” but instead should help the weak and the ill.

Darwin's work and book promoted our modern view: that all humans are the same species; that all people came from “savage” origins; that cultural differences swamp any minor physical differences among peoples.



Also on this date:






















Robot-building pioneer Vaucanson's birthday






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February 6 – Happy Birthday, Mary Leakey

Posted on February 6, 2014


She discovered ancient hominid and other ape skulls. She dug up tools created by humanity's ancient ancestors. She discovered hominid footprints that were made more than 3.6 million years ago. She discovered 15 new species of animals and one new genus.

Mary Leakey, born on this date in 1903, in London, England, was a paleoanthropologist. That means she studied early humans and human ancestors.

She married another paleoanthropologist, Louis Leakey, and she helped train her sons in the science as well. 


The Leakeys have made many contributions to our knowledge of human evolution. One of their most famous dig sites was at Olduvai Gorge in Tanzania, Africa. Mary Leakey also made major discoveries at another Tanzanian site called Laetoli.

  • Find out more about early humans by checking out some of the kids' resources Mr. Donn has gathered here.

I was interested in Mary Leakey's early life. What was her childhood like, that she ended up going into such an adventurous field?

I discovered that her father Erskine Nicol was a painter, and the family moved from place to place as he painted watercolor landscapes. He was also an enthusiast about Ancient Egypt, and the family lived in Egypt for a while. Mary loved to go on long exploratory walks with her father wherever they lived. You can see that she had an adventurous childhood!

Her mother's family, also, was far from boring! Mary's mother, Cecilia Frere, had relatives that included an antiquarian and an archeologist. Also, during the 1800s the Frere family had been active in trying to end slavery in the British colonial empire. They had even established communities for freed slaves, including Freretown, Kenya (Africa); Freretown, South Africa; and Freretown, India.

Now, this is impressive: In 1925, the family was living in France, in Les Eyzies, just when Elie Peyrony was excavating one of the caves in which archeologists had discovered signs of prehistoric humans. Although Mary was just 12 years old, she got permission to go through Peyrony's dump, and she became hooked on prehistory! She made a collection of points, scrapers, and blades that she found in the dump, and she even developed a system of classification!

If you know anything about modern archeology, you might be wondering why Peyrony would've missed points, scrapers, and blades in his dig! Why on earth would such valuable stuff be in his dump?


You see, back in the early 1900s, archeology was still in an early stage, and excavations were not made systematically and scientifically. It was more like a treasure hunt—think Indiana Jones!—than like the patient and painstaking uncovering of evidence that it is today. These days, shards of pottery and bones from ancient trash pits are photographed, measured, and catalogued as carefully as are golden goblets and entire skulls!


Also on this date:



Musician Bob Marley's birthday







Waitangi Day in New Zealand 













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June 1, 2011 - Madaraka Day – Kenya

This national day commemorates the day that Kenya attained self-rule in 1963. (The nation was fully independent from the United Kingdom by December of the same year.) Kenyans will celebrate the day with speeches and shows. You can get idea of the sorts of shows are being put on today by watching this short video (even though the visuals are a bit blurry). 

Kenya, the cradle of humanity...

Many archeologists, such as Richard Leakey, believe that humanity began in what we now call Kenya, because they have found ancient human skeletons and also skeletons from pre-human ancestors. One example is Turkana boy, who was Homo erectus. (Other pre-human skeletons such as Lucy, the famous Australopithecus afarensis, have been found in nearby Ethiopia.)

Read about early pre-humans and prehistoric humans at Kids Past

Learn more about Kenya...

  • Here's a quick quiz about Kenya.

  • Here's a map game about all of Africa.

  • Here is a jigsaw puzzle of a Kenyan scene. (Note: you can choose to have way fewer pieces by clicking the words "Change Cut" on the left side of the screen.)