Karin Bojs: Spår av släktingar för miljarder år sedan I dag, närmare tre tusen år efter det att Första Mosebok först tecknades ned, finns en uppdaterad version baserad på vetenskaplig forskning. Den säger att universum – åtminstone den del av universum som våra instrument kan överblicka – uppstod för 13,7 miljarder år sedan och sedan dess har svalnat och utvidgats kraftigt. Vårt eget solsystem uppstod för ungefär 4,6 miljarder år sedan, från ett hett och roterande gasmoln.
Do-It-Yourself DNA Have you ever wondered how scientists get a sample of DNA from a plant, animal, or other organism? All living organisms have DNA. DNA, which is short for deoxyribonucleic acid, is the blueprint for almost everything that happens inside the cells of an organism — overall, it tells the organism how to develop and function. DNA is so important that it can be found in nearly every cell of a living organism.
Galapagos: Livets början Galápagosöarnas unika växt- och djurliv fascinerade Charles Darwin innan han skrev sin bok om arternas uppkomst och dagens vetenskapsmän fortsätter att göra unika upptäckter när de utforskar ögruppens evolutionära historia. David Attenborough berättar historien om hur den lilla ögruppen mitt ute i Stilla havet skapades ur havet för fyra miljoner år sedan och utvecklade en fascinerande flora och fauna och endemiska djurarter. Här kan du skapa egna klipp ur programmet Hjälp Stäng 1. Early Human Evolution: Early Human Culture Paralleling the biological evolution of early humans was the development of cultural technologies that allowed them to become increasingly successful at acquiring food and surviving predators. The evidence for this evolution in culture can be seen especially in three innovations: Tool Making Some chimpanzee communities are known to use stone and wood as hammers to crack nuts and as crude ineffective weapons in hunting small animals, including monkeys. However, they rarely shape their tools in a systematic way to increase efficiency. The most sophisticated chimpanzee tools are small, slender tree branches from which they strip off the leaves. These twigs are then used as probes for some of their favorite foods--termites and ants. It is likely that the australopithecines were at least this sophisticated in their simple tool use.
Arctic Unit Week 1 This was meant to be our first January unit, but lack of routine and school was getting to us so we went ahead and started a week early. First we looked for the Arctic Circle on our globe and talked about the different countries that make up the Arctic land. I pointed out the Arctic Ocean. (We haven’t really talked about the names of the oceans yet. Does anyone have a good song for that?) Iron(III) oxide - Sciencemadness Wiki Iron(III) oxide, often referred to as red iron oxide, is the chemical compound with chemical formula Fe2O3. It is the main component of rust and acts as the oxidizing agent in the classic thermite reaction with aluminium. Properties
ARKive - Discover the world's most endangered species Wildscreen's Arkive project was launched in 2003 and grew to become the world's biggest encyclopaedia of life on Earth. With the help of over 7,000 of the world’s best wildlife filmmakers and photographers, conservationists and scientists, Arkive.org featured multi-media fact-files for more than 16,000 endangered species. Freely accessible to everyone, over half a million people every month, from over 200 countries, used Arkive to learn and discover the wonders of the natural world. Since 2013 Wildscreen was unable to raise sufficient funds from trusts, foundations, corporates and individual donors to support the year-round costs of keeping Arkive online.
Neanderthal Skeleton May Shed Light to How Cavemen Feel About the Dead Neanderthal Skeleton May Shed Light to How Cavemen Feel About the Dead Staff ReporterFeb 20, 2020 07:31 AM EST Close Pigment Synthetic ultramarine pigment is chemically identical to natural ultramarine Pigment Colours - Classification A pigment is a material that changes the color of reflected or transmitted light as the result of wavelength-selective absorption. This physical process differs from fluorescence, phosphorescence, and other forms of luminescence, in which a material emits light. Preparing a DVD-R to act as a diffraction grating Main image - A segment of a DVD-R bottom layer with the photo-reactive dye removed See also - Does leaving the dye on a DVD-R grating make any difference? All DVD-Rs are made with two layers of moulded polycarbonate about 0.58mm thick, glued together. There is a guide groove for the burning laser moulded into the upper (inside) surface of the lower layer (the 'label' side being the top side of the DVD-R).
How To Teach a 5 to 10 Year Old To Draw a Person The ‘Obvious’ Is Always Overlooked Take a quick look at your student’s or child’s drawing of a person. Ask the ‘obvious’ questions. “Are all the parts assembled in the ‘right’ place?” Do the arms come out of the shoulders?