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I've been planning on improving my Ping Pong Ball Vacuum Cannon for several years, but never really gotten around to it. A couple of months ago, I started on the redesign. Most of the changes were small, but overall they worked out well in a slightly shorter device. Concept A Ping Pong Ball is placed at the end of aPVC pipe. The ends are covered with mylar. Hands On Science - Journal Hands On Science - Journal
THALER'S QUESTION - An EDGE Special Event LEE SMOLIN Founding and Senior Faculty member at Perimeter Institute for Theoretical Physics in Waterloo, Canada; Adjunct Professor of Physics at the University of Waterloo; Author, The Trouble With Physics Perhaps the most embarrassing example from 20th Century physics of a false but widely held belief was the claim that von Neumann had proved in his 1930 text book on the mathematical foundations of quantum mechanics that hidden variables theories are impossible. These would be theories that give a complete description of individual systems rather than the statistical view of ensembles described by quantum mechanics. In fact de Broglie had written down a hidden variables theory in 1926 but abandoned work on it because of von Neumann's theorem. THALER'S QUESTION - An EDGE Special Event
iFixit: The free repair manual
A photo tour of the Large Hadron Collider A photo tour of the Large Hadron Collider Back in July, we were fortunate enough to have the opportunity to tour CERN, home of the Large Hadron Collider. In addition to getting some great information on how the machine gets protons up to speeds nearly that of light, and finding out the sorts of physics that scientists hope to find in its collisions, we also got a great view of some of the control rooms and hardware that help keep everything humming along. Unfortunately, with the LHC active, it wasn't possible to actually go down and see the massive detectors that capture the output of the proton collisions, but there's still a lot to see around CERN. To handle the interest generated by the LHC, CERN has built a new visitor's center to introduce the public to the work that goes on there. For this visit, however, the tour started across the street, next to the CERN gift shop (yes, it has a gift shop).
Retraction Watch “Complete copies” earn physicists in Malaysia a pair of retractions The physics journal Pramana — a publication of the Indian Academy of Sciences — has retracted two studies by a group of researchers in Malaysia who appear to have cobbled together their papers from other sources. The 2007 articles came from A.R.M. Yusoff, M.N. Syahrul and K. Henkel, of the University Science Malaysia, in Penang. Retraction Watch
So, the bad news is that it is looking increasingly likely that the world will experience a very strong El Nino event this 2014-2015 winter (winter in the N. hemisphere, summer down under). There is even talk of a super-El Nino, one to rival 1998′s phenomenal event. Lots of good information on that here at… The last hurricane season in the Atlantic was anemic, being one of least active periods on record. This was attributed to extra dust blown off the Sahara which inhibits hurricane development. ScienceBlogs ScienceBlogs
Em lembrança ao Dia Internacional da Mulher - data que lembra as lutas das mulheres na conquista da igualdade de direitos - republico um texto meu publicado em janeiro na DiCYT sobre as dificuldades enfrentadas pelas cientistas no meio acadêmico. Parabéns a todas as mulheres - cientistas ou não - e meus agradecimentos especiais às entrevistadas, que tiveram infinita paciência comigo. (Mais abaixo uma seleção de links de material relacionado.) A respeito da participação das mulheres na produção científica Roberto Takata/DICYT A Académie des science de Paris, uma das mais antigas agremiações científicas em funcionamento contínuo, foi fundada em 1666 pelo rei Luís 14. Ela assistiu a uma revolução que derrubou a monarquia, à ascensão e queda do império napoleônico, a duas guerras mundiais, o sufrágio feminino, o maio de 1968, e à descolonização da África e à guerra da independência da Argélia, para, só em 1979 admitir a primeira mulher em seu quadro associativo. Gene Repórter Gene Repórter
ESTE OU AQUELE? Postado por Tine Araujo Ontem, conversando com Pedro, resolvemos divulgar algumas informações pontuais, como foi feito para as Luluzinhas e divulgaremos aqui um pouco do Perfil do Blogueiro Paranaense. Os blogueiros paranaenses representam 7,87% dos blogueiros brasileiros, a média de idade é de 26 anos, um pouco mais alta que a do Brasil que gira em 25 anos. ESTE OU AQUELE?
Atheism and skepticism

Open access to 931,797 e-prints in Physics, Mathematics, Computer Science, Quantitative Biology, Quantitative Finance and Statistics 10 Apr 2014: Introducing q-fin.EC and q-fin.MF See cumulative "What's New" pages. Read robots beware before attempting any automated download Physics Mathematics e-Print archive e-Print archive
Physics Help and Math Help - Physics Forums
Free Online Course Materials | MIT OpenCourseWare
Distance Learning Courses and Adult Education - The Open Univers
William J. BeatyElectrical Engineer, U. of Washington Jump down to Highly Recommended Books or Build-it Projects. What's the relation between Watts, Ohms, Amps, and Volts?Memorizing facts? Articles on "Electricity" Articles on "Electricity"
Electronics Demonstrations
Electricity and Magnetism Electricity and Magnetism Timeline of Electricity and Magnetism - Our timeline guides you through the highlights of electricity and magnetism across the globe, from the first compasses in China to the invention of magnetic core computer memory at the Massachusetts Institute of Technology and beyond. Pioneers in Electricity and Magnetism - Ampere, Celsius, Kelvin, Hertz, Tesla: These terms are familiar to all science students. Behind them is a group of scientists who went down in history for their groundbreaking work in magnetism and electricity. Who were these brilliant inventors, physicists and chemists, and what lasting contributions did they make to their fields – and to our lives? Electricity and Magnetism
Slashdot Stories (10)
Hacker News - Information About Viruses, Hackers and Spam
The Socratic Method The Socratic Method:Teaching by Asking Instead of by Tellingby Rick Garlikov The following is a transcript of a teaching experiment, using the Socratic method, with a regular third grade class in a suburban elementary school. I present my perspective and views on the session, and on the Socratic method as a teaching tool, following the transcript. The class was conducted on a Friday afternoon beginning at 1:30, late in May, with about two weeks left in the school year. This time was purposely chosen as one of the most difficult times to entice and hold these children's concentration about a somewhat complex intellectual matter. The point was to demonstrate the power of the Socratic method for both teaching and also for getting students involved and excited about the material being taught.
Work Accomplished = Time Spent x Intensity April 8th, 2014 · 35 comments The Straight-A Method In the early 2000′s, I was obsessed with study habits. Study Hacks
Lifehacker, tips and downloads for getting things done
Skip to this page's content National Geographic Society P.O. Box 98199 Washington, DC 20090-8199 USA Sign In Join Nudibranchs—Photo Gallery—National Geographic Magazine
Wolfram MathWorld: The Web's Most Extensive Mathematics Resource
A Difference Engine Built With LEGO® Pieces
Collatz conjecture
UVa Online Judge - Home
Thinking Machine 4
Weasel program
Mathway: Math Problem Solver
the museum of science, art and human perception
Personal and Historical Perspectives of Hans Bethe
The Scale of the Universe
BrainPOP - Animated Educational Site for Kids - Science, Social
The PHYLO project.
Bad Astronomy
Bad Science
Ben Goldacre
What Does a Solar Flare Sound Like?
The Loom
Smithsonian Human Origins Program - Smithsonian National Museum
This Week in Science - The Weekly Science Talk Radio Show and Po
TWiT Live - Netcasts you love, from people you trust
Still Face Experiment: Dr. Edward Tronick
TED: Ideas worth spreading - For a fact based world view.
The Periodic Table of Videos - University of Nottingham
Tabela Periódica
Imagens da Tabela Periódica | 112 elementos em fotos e imagens
Spectrum: A Robot That Balances on a Ball