The earliest split in modern humanity was 100,000 years ago. What's interesting is that as a result of this split, populations within the Khoisan group should about as much genetic diversity as the rest of humanity does combined.
And that's including every other genotype within Africa. Once you eliminate the African populations from the pool it gets even narrower, to the point that the genetic differences between Eurasians, Amerinds, and Australian aborigines are remarkably small comparatively. Did fist fighting change the course of human evolution? Protective buttressing of the human fist and the evolution of hominin hands. + Author Affiliations ↵* Author for correspondence (email@example.com) Received June 6, 2012.
Accepted September 24, 2012. The derived proportions of the human hand may provide supportive buttressing that protects the hand from injury when striking with a fist. Flexion of digits 2–5 results in buttressing of the pads of the distal phalanges against the central palm and the palmar pads of the proximal phalanges. Additionally, adduction of the thenar eminence to abut the dorsal surface of the distal phalanges of digits 2 and 3 locks these digits into a solid configuration that may allow a transfer of energy through the thenar eminence to the wrist.
The Loom. Your hands are, roughly speaking, 360 million years old.
Before then, they were fins, which your fishy ancestors used to swim through oceans and rivers. Once those fins sprouted digits, they could propel your salamander-like ancestors across dry land. Fast forward 300 million years, and your hands had become fine-tuned for manipulations: your lemur-like ancestors used them to grab leaves and open up fruits. Rediscovering Life. Notes and Commentaries Toward a Biology Worthy of Life Stephen L.
Talbott RSS Feed for this page: This page serves as a portal introducing all new content for the “Biology Worthy of Life” project: BiologyWorthyofLife.org. Copyright 2014 The Nature Institute. Life Sciences. SCIENCE. Scientific Ideas for the Garbage Dump - On Science Blogs. Hello there!
If you enjoy the content on On Science Blogs, consider subscribing for future posts via email or RSS feed. These scientific ideas will drive you crazy.
New Research Info. The 100 Top Science Stories of 2010. Ernest Rutherford’s Nucleated Century. The critical discovery in this atomic model emerged a century ago in a talk before the Manchester Literary and Philosophical Society in March 1911 and a paper published soon after in the Philosophical Magazine.
Both were by Ernest Rutherford, who had won the 1908 Nobel Prize in Chemistry in part for his discovery of the alpha particle, which he later proved was the nucleus of a helium atom. By 1911, scientists had already measured the charge and mass of an electron. But no one was sure how the atom was structured. Child creates molecule that could be used for energy storage or explosives. Prof.
Robert Zoellner, with a model of the molecule created by ten year-old Clara Lazen I don't know about other people, but when I was a child, I was inventing things such as a musical instrument made out of a folded piece of cardboard and some rubber bands. Ten year-old Clara Lazen, however, has done something a little more noteworthy. The fifth-grader from Kansas City, Missouri, built a model of a molecule that is new to science. If the molecule itself were to actually be created, it could possibly be used for energy storage, or in explosives.
On Truth & Reality: Philosophy Physics Metaphysics of Space, Wave Structure of Matter. Famous Science Art Quotes. JST Virtual Science Center. Science. The more we understand about science and its complexities, the more important it is for scientific data to be shared openly.
It’s not useful to have ten different labs doing the same research and not sharing their results; likewise, we’re much more likely to be able to pinpoint diseases if we have genomic data from a large pool of individuals. Since 2004, we’ve been focusing our efforts to expand the use of Creative Commons licenses to scientific and technical research.
CHEMISTRY & PHYSICS. Physics and biology sites. Otherwise, there are a quite a lot of sites out there covering physics and biology at this level, but my impression of them is that they would be good for revision, but not so good if you were struggling to understand something in the first place.
If you want to find what is available a Google search on "a level" physics or "a level" biology should throw up a good selection. If you are doing some other exam - IB, for example, or Scottish Highers - you could try searching for these in a similar way, but it would still be worth looking for A level sites (and vice versa for A level students). Specials archive : Nature. Prokaryotes, Eukaryotes, & Viruses Tutorial. Chemistry - few periodic rules to rule them all :) Interactive Concepts in Biochemistry - Interactive Animations. Organic Chemistry Animations ChemTube3D. CHEM 1211 COURSE CONTENTS. CHEM 1151 LECTURE - GPC, Dunwoody Most of the lectures will be based on the PowerPoint notes below (~70%), and these will be reinforced with some additional board work (~30%).
Virtual Laboratory: Thermodynamic Equilibrium. Here is a snapshot of the applet. Read the instructions and then go to the links at the bottom of this page to activate various kinds of experiments that can be done with this applet. This applet is designed to simulate the diffusion process which occurs when gases of different temperatures are mixed. To activate the mixing click one time on the red vertical bar that separates the two chambers.
After a few moments, the bar will turn green and the gases will start to mix and share their energy. The counters in the respective chambers indicate the number of particles in that chamber. Click chemistry. Click chemistry, a term coined by K. Barry Sharpless in 1998, was first fully described by K. Barry Sharpless, Hartmuth Kolb, and M.G. Finn of The Scripps Research Institute in 2001 and describes chemistry tailored to generate substances quickly and reliably by joining small units together. Click chemistry is not a single specific reaction, but was meant to mimic nature, which also generates substances by joining small modular units. Understanding Chemistry - interesting links.
REALLY GOOD STUFF. Autopoiesis. SCIENCE. ORGANICA. Ethnobotany. Health ReferencEd. Science News & Organizations. 13 things that do not make sense - space - 19 March 2005. Read full article Continue reading page |1|2|3|4|5|6 Read more: 13 more things that don't make sense 1 The placebo effect.
It's just like on December 31, our calendar comes to an end, but a new calendar begins on January 1. " 6 Insane Discoveries That Science Can't Explain.