Science News: Nanoguitar Photo by D. Carr and H. Craighead, Cornell. The world's smallest guitar is 10 micrometers long -- about the size of a single cell -- with six strings each about 50 nanometers, or 100 atoms, wide. Made by Cornell University researchers from crystalline silicon, it demonstrates a new technology for a new generation of electromechanical devices. The world's smallest guitar -- carved out of crystalline silicon and no larger than a single cell -- has been made at Cornell University to demonstrate a new technology that could have a variety of uses in fiber optics, displays, sensors and electronics. The "nanoguitar" -- made for fun to illustrate the technology -- is just one of several structures that Cornell researchers believe are the world's smallest silicon mechanical devices. "We have a new technology for building the smallest mechanical devices," said Harold G. The guitar has six strings, each string about 50 nanometers wide, the width of about 100 atoms. Photo by D. Photo by D.
How 7 billion live The World of Seven Billion The map shows population density; the brightest points are the highest densities. Each country is colored according to its average annual gross national income per capita, using categories established by the World Bank (see key below). Some nations— like economic powerhouses China and India—have an especially wide range of incomes. The Science Creative Quarterly & A DIALOGUE WITH SARAH, AGED 3: IN WHICH IT IS SHOWN THAT IF YOUR DAD IS A CHEMISTRY PROFESSOR, ASKING “WHY” CAN BE DANGEROUS - StumbleUpon SARAH: Daddy, were you in the shower? DAD: Yes, I was in the shower. SARAH: Why? DAD: I was dirty. DAD: Why does the shower get me clean? SARAH: Yes. DAD: Because the water washes the dirt away when I use soap. DAD: Why do I use soap? DAD: Because the soap grabs the dirt and lets the water wash it off. DAD: Why does the soap grab the dirt? DAD: Because soap is a surfactant. DAD: Why is soap a surfactant? DAD: That is an EXCELLENT question. DAD: Why does soap form micelles? DAD: Soap molecules are long chains with a polar, hydrophilic head and a non-polar, hydrophobic tail. SARAH: Aidrofawwic DAD: And can you say ‘hydrophobic’? DAD: Excellent! DAD: Why does it mean that? DAD: It’s Greek! SARAH: Like a monster? DAD: You mean, like being afraid of a monster? DAD: A scary monster, sure. (pause) SARAH: (rolls her eyes) I thought we were talking about soap. DAD: We are talking about soap. (longish pause) DAD: Why do the molecules have a hydrophilic head and a hydrophobic tail? DAD: That’s complicated.
stereomood – emotional internet radio - music for my mood and activities Pictures of Pennies Hi, I'm Mitch Fincher and these pages are from a talk I gave while a Civil Engineering student at Texas Tech University. The following is the basic pattern for building cantilevered structures with Pennies. Although it looks trivial, we can build amazing structures with these pillars. All penny columns are ten pennies high, a "stack". Two side-by-side pennies held in place by a penny above them is called a "triad". Now, I'll show you how to build a simple bridge. Carefully filling the space between with pennies, we create a one penny-span bridge. Repeating the process by putting an extra triad on top of each stack, we can create a two penny-span bridge. Although it looks weak, it will actually hold quite a bit of weight. We can move on to a three penny-span bridge. And finally to six and seven penny-span bridges. Click "Next" to move on to "The Big Tower". Submit your amazing coin stacking pictures. Note: All stacks of coins were done without any glue.
Simple animation to explain complex principles - Electronics 1, aircraft radial engine 2, oval Regulation 3, sewing machines 4, Malta Cross movement - second hand movement used to control the clock 5, auto change file mechanism 6, auto constant velocity universal joint 6.gif 7, gun ammunition loading system 8 rotary engine - an internal combustion engine, the heat rather than the piston movement into rotary movement # Via World Of Technology. 1, inline engine - it's cylinders lined up side by side 2, V-type engine - cylinder arranged at an angle of two plane 3, boxer engine - cylinder engine arranged in two planes relative Extreme Street View: Google Employee Maps Deserted Island Extreme Street View: Google Employee Maps Deserted Island Article by Urbanist, filed under Urbex & Parkour in the Global category. Street View has mapped much more than roads in its, but sending a lone urban explorer through the haunting multistory ruins of a remote island may be one of their riskiest geographic ventures yet. Strapped with panoramic photography equipment, this video shows a lone Google employee crawling through rubble, scaling partially caved-in abandonments and standing on precarious roofs, all to document one of the most unique deserted cities on the globe. Occupied for over a century, and briefly the world’s most densely-populated island, Gunkanjima, Japan (aka Hashima) is now one of the loneliest places on the planet. Side trivia: if it looks familiar, you may be remembering it from scenes of Skyfall, the James Bond film. A giant concrete wall surrounds the ship-shaped Battleship Island, giving it its nickname.
Math, Physics, and Engineering Applets Oscillations and Waves Acoustics Signal Processing Electricity and Magnetism: Statics Electrodynamics Quantum Mechanics Linear Algebra Vector Calculus Thermodynamics Mechanics Miscellaneous Licensing info. Links to other educational sites with math/physics-related information or java applets useful for teaching: And when you get tired of learning, here is some fun stuff: Pong Simulation Circuit-level simulation of original 1972 Pong. Lots of Jokes - Did You Know? - StumbleUpon Q. Why do men's clothes have buttons on the right while women's clothes have buttons on the left? A. When buttons were invented, they were very expensive and worn primarily by the rich. Since most people are right-handed, it is easier to push buttons on the right through holes on the left. Because wealthy women were dressed by maids, dressmakers put the buttons on the maid's right! Q. A. Q. A. Q. A. Q. A. Q. A. Q. A. Q. A. Q. A. Mary liked this a lot and when returned to Scotland (not a very good idea in the long run), she took the practice with her. Q. A. Q. A.