K-MODDL > Tutorials > Reuleaux Triangle If an enormously heavy object has to be moved from one spot to another, it may not be practical to move it on wheels. Instead the object is placed on a flat platform that in turn rests on cylindrical rollers (Figure 1). As the platform is pushed forward, the rollers left behind are picked up and put down in front. An object moved this way over a flat horizontal surface does not bob up and down as it rolls along. Is a circle the only curve with constant width? How to construct a Reuleaux triangle To construct a Reuleaux triangle begin with an equilateral triangle of side s, and then replace each side by a circular arc with the other two original sides as radii (Figure 4). The corners of a Reuleaux triangle are the sharpest possible on a curve with constant width. Other symmetrical curves with constant width result if you start with a regular pentagon (or any regular polygon with an odd number of sides) and follow similar procedures. Figure 1: Platform resting on cylindrical roller
Denisova Cave and the Mystery of the mtDNA Phylogenetic Tree « Rokus Blog Nobody expected a great surprise. Genetic testing of the little finger of an early hominin child found in the Siberian Denisova Cave, Kostenki, in the middle of archeological remains pertaining to Upper Paleolithic culture, would almost for sure confirm DNA similar to ours. There was a slim change that the pinky belonged to a Neanderthal from the neighborhood that got lost, but everything pointed at a an unequivocal member of the advanced group of hominins responsible for introducing symbolic art all over the world, the so-called anatomically modern humans (AMH). The collection of personal adornments and artifacts suggestive of symbolic behavior from the Early Upper Paleolithic deposits of Denisova Cave, Altai, is one of the earliest and the most representative of the Upper Paleolithic assemblages from Northern and Central Asia. Humans spend more time gathering around the campfire to celebrate their victory on Nature, only to challenge evolution in an entirely new way. Dr.
Physics Formulary: Table of Contents Last change: December 16, 2009 This document is a LaTeX file of 108 pages which contains a lot of equations in physics. It is written at advanced undergraduate/postgraduate level. A list of recent additions and improvements is available. Download options physics.tex: an English LaTeX file (Approximately 310kb). physics.zip: a zipped English LaTeX file (Approximately 100kb). Equations in physics - Contents The table of contents from "Equations in Physics" is shown below. Physical Constants 1 1. 100 Best Science Documentaries Online No matter how much you know, there is always something new to learn about science. While your college courses may cover the basics, you can get a more in-depth look at a wide variety of topics from Internet resources such as these great documentaries. These selections will help you explore everything from the inner reaches of the human mind to the outer areas of our universe and just about everything else in between. Better yet, they’re all free to watch online so you can learn more without spending a dime. Health and Medicine These documentaries cover topics like health care, diseases, nutrition, nursing, and more so you can get great insights into health and medicine. Super Size Me: In this movie, filmmaker Morgan Spurlock attempts to subsist on only a diet of McDonald’s for a full month. Drugs Learn how drugs impact the brain and the variety of legal restrictions imposed upon them from these documentaries. Genetics Evolution and Biological History Physics The Quantum Revolution: Dr. Geology
Liquid universe Public release date: 13-Oct-2004 [ Print | E-mail Share ] [ Close Window ] UK CONTACT - Claire Bowles claire.bowles@rbi.co.uk 44-207-611-1210New Scientist Press Office, London US CONTACT – Toni Marshalltoni.marshall@newscientist.com617-558-4939New Scientist Boston office The cosmos was born in a churning fluid 300 million times hotter than the sun. In QCD, it is the vacuum that imprisons the quarks. A pair of virtual particles from the vacuum are given enough energy that they become real, and fly apart in opposite directions. "There's no doubt. This makes the plasma more similar to a liquid than a gas. This is part of a Feature article that appears in New Scientist issue: 16 October 2004. [ Print | E-mail AAAS and EurekAlert!
Nanotechnology Basics Home > Introduction > Nanotechnology Basics Nanotechnology Basics Last Updated: Friday, 14-Jun-2013 09:28:04 PDT What is Nanotechnology? Answers differ depending on who you ask, and their background. Broadly speaking however, nanotechnology is the act of purposefully manipulating matter at the atomic scale, otherwise known as the "nanoscale." Coined as "nano-technology" in a 1974 paper by Norio Taniguchi at the University of Tokyo, and encompassing a multitude of rapidly emerging technologies, based upon the scaling down of existing technologies to the next level of precision and miniaturization. Foresight Nanotech Institute Founder K. In the future, "nanotechnology" will likely include building machines and mechanisms with nanoscale dimensions, referred to these days as Molecular Nanotechnology (MNT). Click image for larger version. This image was written using Dip-Pen Nanolithography, and imaged using lateral force microscopy mode of an atomic force microscope. "We know it's possible.
Controlled Demolition, Inc. | 125 Great Science Videos: From Astronomy to Physics & Psychology Astronomy & Space Travel A Brief, Wondrous Tour of Earth (From Outer Space) - Video - Recorded from August to October, 2011 at the International Space Station, this HD footage offers a brilliant tour of our planet and stunning views of the aurora borealis.A Universe from Nothing - Video - In 53 minutes, theoretical physicist Lawrence Krauss answers some big enchilada questions, including how the universe came from nothing.A Year of the Moon in 2.5 Minutes - Video - The Lunar Reconnaissance Orbiter has been orbiting the moon for over a year. The footage gets compressed into 2 slick minutes.A Day on Earth (as Seen From Space) - Video - Astronaut Don Pettit trained his camera on planet Earth, took a photo once every 15 seconds, and then created a brilliant time-lapse film.Atlantis's Final Landing at Kennedy Space Center - Video - After more than 30 years, the space shuttle era comes to a close. Video runs 30 minutes. Physics Biology & Chemistry Environment, Geology and & Ecology