What is homo: Definition and 23 Discussions

Homo (from Latin homō 'human') is the genus that emerged in the genus Australopithecus that encompasses the extant species Homo sapiens (modern humans), along with several extinct species classified as either ancestral to or closely related to modern humans, including Homo erectus and Homo neanderthalensis. The oldest member of Homo is Homo habilis with records of just over 2 million years ago. Homo, together with the genus Paranthropus, is probably sister to Australopithecus africanus, which itself had previously split from the lineage of Pan, the chimpanzees.Homo erectus appeared about 2 million years ago and, in several early migrations, spread throughout Africa (where it is dubbed H. ergaster) and Eurasia. It is likely that the first human species lived in a hunter-gatherer society and was able to control fire. An adaptive and successful species, H. erectus persisted for more than a million years and gradually diverged into new species by around 500,000 years ago.Anatomically modern humans (Homo sapiens) emerged close to 300,000 to 200,000 years ago, in Africa, and H. neanderthalensis emerged around the same time in Europe and Western Asia. H. sapiens dispersed from Africa in several waves, from possibly as early as 250,000 years ago, and certainly by 130,000 years ago, the so-called Southern Dispersal beginning about 70–50,000 years ago leading to the lasting colonisation of Eurasia and Oceania by 50,000 years ago. Both in Africa and Eurasia, H. sapiens met with and interbred with archaic humans. Separate archaic (non-sapiens) human species are thought to have survived until around 40,000 years ago (Neanderthal extinction).

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  1. P

    I Colorless Compounds and electromagnetic radiation

    I was trying to understand why some compounds appear colorless (transparent) and tried to give an explanation. I take benzene as an example: it is a chromophore group in which there is π-conjugation, so a certain energy gap is generated between HOMO and LUMO. This energy gap is such that in...
  2. BillTre

    Homo Naledi: 5 Yr Update & New Findings (2021)

    I found this video by a guy involved with the ongoing cave work involved in further work on these interesting Homo fossils (Homo naledi). I think it is 5 years old. This is after the initial reports of their discovery. They found more stuff out. There are a lot cave shots. Very tight places...
  3. Astronuc

    Homo Sapiens in southern Europe, ~44-46K years ago?

    An international team of archaeologists exploring the Bacho Kiro (Бачо Киро) cave in Bulgaria since 2015 determined that a molar (tooth) the found is dated to about 44,000-46,000 years old...
  4. pinball1970

    Earliest Homo erectus fossil dated

    The previously oldest H. Erectus fossil was dated 1.85 million years from Georgia. These specimens from South Africa have been dated 200,000 years earlier, pre dating a magnetic 'flip' that occurred in the Earth's magnetic field 1.95 million years ago. This magnetic reversal was one of part of...
  5. jim mcnamara

    Possible new species of Homo

    A new species of Homo from the Late Pleistocene of the Philippines Florent Détroit, Armand Salvador Mijares, Julien Corny, Guillaume Daver, Clément Zanolli, Eusebio Dizon, Emil Robles, Rainer Grün & Philip J. Piper Naturevolume 568, pages181–186 (2019)...
  6. B

    Do most caucasian homo sapiens have some Neanderthal DNA?

    I just received the results from the DNA tests that I ordered at 23andme.com. According to 23andme, I have 298 Neanderthal variants in my DNA. 23andme says that I have more Neanderthal DNA in my genes than 80% of 23andme customers. This has really gotten me thinking about Neanderthal DNA, and...
  7. C

    Exploring the Absolute HOMO: Spectroscopy & Beyond

    What exactly is the absolute highest occupied molecular orbital? I think, as the name suggests, it's the absolute highest occupied molecular orbital in a molecule. Could it be determined using spectroscopy? Maybe, depending on the type. You could use UV-Vis if the energy gap between the HOMO...
  8. 1oldman2

    New Homo Sapiens timeline findings

    This considerably pushes back the timeline for H. Sapiens https://www.nature.com/nature/journal/v546/n7657/full/nature22336.html
  9. Evo

    Mystery Species of Human Relative Discovered: Homo Naledi

    It will be interesting to see what comes of this. https://www.yahoo.com/news/homo-naledi-mystery-human-species-091635429.html
  10. leighflix

    Hetero and Homo clarification

    I've just recently started relearning chemistry. Forgive me for asking such a basic question, but my textbook doesn't use very practical examples with a detailed explanation. So a hetero and homo mixture can be classified as if there compositions (multiple substances) are blended or not. Let's...
  11. kostoglotov

    Soln space basis for all constant coeff homo linear DE's?

    From what I've seen so far, the basis of the solution space for all the constant coefficient homo linear DE's have been linear combinations of the exponential function e or of some polynomial multiplied by the exponential function. Is this always true that these DE's always result in solutions...
  12. Drakkith

    Homo naledi, a New Species of the Genus Homo

    Just saw an article on this on facebook: Abstract Homo naledi is a previously-unknown species of extinct hominin discovered within the Dinaledi Chamber of the Rising Star cave system, Cradle of Humankind, South Africa. This species is characterized by body mass and stature similar to...
  13. Calpalned

    Human evolution -- Neanderthals and Homo Erectus

    What differentiates a homo erectus from a neanderthal? They look very similar as they both lack chins and have brow ridges. To me, a neanderthal seems like a large brained homo erectus. Modern human skulls, on the other hand, look completely different. Thanks
  14. Monique

    World’s Oldest Engraving by Homo erectus

    Amazing, a piece of creative expression... between 540,000 and 430,000 years old... made by Homo erectus. "The engraving was probably made on a fresh shell specimen still retaining its brown [skin], which would have produced a striking pattern of white lines on a dark ‘canvas'" World’s Oldest...
  15. C

    Diels Alder - Why HOMO and LUMO?

    In diels alder reactions, why does the reaction always occur between the HOMO of the diene, and the LUMO of the dienophile? Well, what I'm really trying to figure out is how to determine which reactant donates the electrons, and which reactant receives them in cycloadditions.
  16. L

    Antibonding orbital, LUMO and HOMO

    Hi there I have some questions regarding those three things. First off, the antibonding orbital, which I am having a hard time comprehending. So as far as I understand most atoms in organic chemistry have those antibonding orbitals, for instance a carbonyl carbon, where I imagne the...
  17. M

    Homo Sapien vs. Chimpanzee - Divergence Timeline

    What is wrong with this logic? Homo Sapien 1. 46 (diploid) chromosomes 2. 32,185 genes 3. 3,079,843,747 bases (DNA bases A,C,T,G) 4. Homo sapines diverged from chimpanzees 6 million years ago. 5. There is a 3% difference in the genetic makeup of a homo sapien and a chimpanzee. 6...
  18. K

    Solve First Order Homogeneous ODE | Constants a and b | Help Needed!

    Hi, need help solving a first order homogeneous ODE. y'(x)-(a/x)y = b/(x(1+x)^2) Here a and b are some constants. Need to solve this for y. My attempts so far have been to use But this means solving ∫ x^(-a)/(x(1+x)^2) dx which has solutions in terms of Gauss hyper-geometric functions...
  19. Z

    Bonding analysis at HOMO, could you please give me some hints.

    Hi all, Currently, I'm reading the paper: Direct to indirect band gap transition in ultrathin ZnO nanowires under uniaxial compression [APPLIED PHYSICS LETTERS 94, 113114, 2009]. You can download this paper from the following url...
  20. James889

    A second order non homo differential equation

    Hi, i have the following non-homo differential equation. y^{\prime\prime}+4y = 2~cos~x + 3x~sin~x \begin{cases} y(0) = 1 \\ y^{\prime}(0) = 2 \end{cases} Since there is a 3x term in front of sin x. What is the form of the solution for this problem? if it hadn't been there it...
  21. F

    Homo Sapiens Heidelbergensis -> Homo Neanderthalensis?

    Both modern man homo sapiens and the Neandertals homo neanderthalensis are presumed to have evolved from Heidelberg man homo heidelbergensis. Because heidelbergensis is so physically similar to sapiens Heidelberg man was, for a long time, known as Archaic homo sapiens, in which case the...
  22. N

    Danger of UV to Homo Sap?

    In another thread there's a discussion of the wavelength limits of the human visual system. A question has arisen re the damage that UV can have on the eye; specifically by wavelength and intensity. Can anyone help? There's tons of material on the internet, but how to judge what's...
  23. M

    Are homo sapiens a cybernetic life-form?

    :wink: Homo sapiens: A cybernetic life-form, native to the third planet from a medium sized star. Primary food sources: Petroleum oil Ferrous metals Water Trace amounts of organic material :wink: O.k. so I'm kidding, but only partly. Consider; how many of us would starve without...