Human evolution overview | Life on earth and in the universe | Cosmology & Astronomy | Khan Academy
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Cambrian explosion and biodiversity in the Phanerozoic Eon. Created by Sal Khan. Watch the next lesson: https://www.khanacademy.org/science/cosmology-and-astronomy/life-earth-universe/humanity-on-earth-tutorial/v/understanding-calendar-notation?utm_source=YT&utm_medium=Desc&utm_campaign=cosmologystronomy Missed the previous lesson? https://www.khanacademy.org/science/cosmology-and-astronomy/life-earth-universe/history-life-earth-tutorial/v/first-living-things-on-land-clarification?utm_source=YT&utm_medium=Desc&utm_campaign=cosmologystronomy Cosmology & Astronomy on Khan Academy: The Earth is huge, but it is tiny compared to the Sun (which is super huge). But the Sun is tiny compared to the solar system which is tiny compared to the distance to the next star. Oh, did we mention that there are over 100 billion stars in our galaxy (which is about 100,000 light years in diameter) which is one of hundreds of billions of galaxies in just the observable universe (which might be infinite for all we know). Don't feel small. We find it liberating. Your everyday human stresses are nothing compared to this enormity that we are a part of. Enjoy the fact that we get to be part of this vastness! About Khan Academy: Khan Academy offers practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace in and outside of the classroom. We tackle math, science, computer programming, history, art history, economics, and more. Our math missions guide learners from kindergarten to calculus using state-of-the-art, adaptive technology that identifies strengths and learning gaps. We've also partnered with institutions like NASA, The Museum of Modern Art, The California Academy of Sciences, and MIT to offer specialized content. For free. For everyone. Forever. #YouCanLearnAnything Subscribe to Khan Academy’s Cosmology & Astronomy channel: https://www.youtube.com/channel/UChNPnEkW8LYZ5Rwi8_A2-DA?sub_confirmation=1 Subscribe to Khan Academy: https://www.youtube.com/subscription_center?add_user=khanacademy
Comments
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Unfortunately this is still the traditional view of human evolution, anthropocentric (just-so, pre-darwinian), e.g.
1) Statistically it's impossible that all australopiths are closer relatives of Homo than of Pan or Gorilla: that 1 extant species (H.sapiens) has hundreds of fossils, and 4 or 5 other extant species have virtually no fossils (bonobo, common chimpas, high- & lowland gorilla (whereas Asian great apes (Pongo) have a lot of fossil relatives, e.g. Siva-, Lufeng-, Khorat-, Gigantopithecus). The so-called "human" features in australopiths ("bipedality" etc.) are not derived-human but most likely primitive-hominid (or even primitive-hominoid, e.g. extant gibbons as well as Morotopithecus c 20 mill.yrs ago & probably most Mio-Pliocene "apes" have/had vertical spines; and Pan & Gorilla before birth have humanlike feet which near birth become more hand-like (e.g. C.Coon)). IOW, it's well possible that australomiths are ancestors of chimps & gorillas.
2) Homo were no savanna dwellers or distance runners or open plain hunters as still often assumed without evidence (physiologically impossible, e.g. sweat = water+salt = scarce on savannas, but overheated furseals on land sweat abundantly). Pleistocene Homo spread intercontinentally along African & Eurasian coasts (even reached islands far overseas: Crete, Flores, Sulawesi etc.) & from the rivers ventured inland (initially seasonally?) along the rivers, collecting littoral, shallow-aquatic & waterside plant & animal foods. Seafood is extremely rich in brain-specific nutrients (iodine, DHA, taurine etc.), and when Homo dispersed along the coasts to Java, Flores, Happisburgh & the Cape, they used stones to open shell- & crayfish, but also to butcher waterside carcasses of ungulates or stranded whales, as well as cattails (traces on neandertal tools), roots of waterlilies (neandertal plaque) & waternuts (H.erectus) etc. Google e.g. Homo econiche. -
Interesting
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Thanks
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good for learning
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very nice, thanks
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This is a bit incorrect but yeah gives a good overview. We don't evolve from apes, we simply evolve from a common ancestor which had very similar characteristics to modern apes.
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I think that we should stop using the word "belief" for scientific theory. And the word "theory" as well, it's too confusing for theists.
Believe - have evidence to support
Theory - can build an assumption on available evidence -
(AFTER MASS EXTINCTION EVENT.) Mammal, "Guys! Lets move to trees!"
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I LOVE DINOSAURS
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Khan is a genius!!! Is there anything he doesn't know??
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The non homo spaiens watching were especially interested in the last 5 videos.
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By standard epistemology, most people claim that you are justyfied to claim knowledge if you have justification to do so. He does not have justification to claim that souls do not exists. But he can claim that people making claims about the existens of souls, are not justified in doing so. But you are right, he is not justified in claiming to know that souls do not exists. (From most philosophers view.) Just like no one can claim to know that santa exists. But he might see it as usefull.
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I asked a question.
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What is a soul? How do you know it exists? If it exists, how do you know that it exists in humans? How do you know that it doesn't exist in apes?
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You need to be qualified to make claims?
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can we stop debating whether evolution is real or not?
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Thanks for the video. I just don't understand why scientific evidence is always immediately discredited by bible thumpers. Don't religious people go to doctors and hospitals to be treated or do they pray away the pain? It's the same science built from the same scientific theories.
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Souls are a concept in fiction. They aren't tangible and do not exist in reality.
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I am just curious, we all know that we have something call soul, thus we do think, create, and utilize things. By the same token if the great apes were our ancestors, why don't they have souls? Or did something happen during the "great" evolution process?
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Maybe because they actually are.
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