Harald Haas: Wireless data from every light bulb

How to Extract DNA from Anything Living First, you need to find something that contains DNA. Since DNA is the blueprint for life, everything living contains DNA. For this experiment, we like to use green split peas. Visible light communication Visible light communication (VLC) is a data communications medium which uses visible light between 400 and 800 THz (780–375 nm). VLC is a subset of optical wireless communications technologies. The technology uses fluorescent lamps (ordinary lamps, not special communications devices) to transmit signals at 10 kbit/s, or LEDs for up to 500 Mbit/s. Low rate[vague] data transmissions at 1 and 2 kilometres (0.6 and 1.2 mi) were demonstrated.[1][2] RONJA achieves full Ethernet speed (10 Mbit/s) over the same distance thanks to larger optics and more powerful LEDs.

Underwater wi-fi given test run to create 'deep-sea internet' 16 October 2013Last updated at 07:08 ET The team dropped two 40lb (18kg) sensors into a lake near Buffalo Researchers have tested an "underwater wi-fi" network in a lake in an attempt to make a "deep-sea internet".

How to Build a Robot Tutorial - Society of Robots Introduction to Gears No good robot can ever be built without gears. As such, a good understanding of how gears affect parameters such as torque and velocity are very important. In this tutorial I will first talk about the basics of gears, how to use them properly along with simple equations, and then I will go into specific types of gears. Mechanical Advantage, Torque vs. Rotational Velocity Gears work on the principle of mechanical advantage. This means that by using different gear diameters, you can exchange between rotational (or translation) velocity and torque. Photophone This article is about Alexander Graham Bell and Sumner Tainter's optical phone. For the sound-on-film technology, see RCA Photophone. A historical plaque on the side of the Franklin School in Washington, D.C. which marks one of the points from which the photophone was demonstrated A diagram from one of Bell's 1880 papers

Healthcare.gov: Code Developed by the People and for the People, Released Back to the People - Alex Howard This new flagship federal .gov website is "open by design, open by default." That's a huge win for the American people. Healthcare.gov As the first website to be demonstrated by a sitting President of the United States, Healthcare.gov already occupies an unusual place in history. In October, it will take on an even more important historic role, guiding millions of Americans through the process of choosing health insurance. How a website is built or designed may seem mundane to many people, but when the site in question is focused upon such an important function, what it looks like and how it works matter. Build Your Own ELECTRIC MOTORCYCLE The finished project is a 1981 Kawasaki KZ440, converted to electric. It is powered by four Optima Yellow Top sealed (AGM) lead-acid batteries, that drive a Briggs & Stratton Etek electric motor. The speed of the motor is controlled by an Alltrax brand "AXE" programmable controller that can run at up to 48 volts and 300 amps. Contrary to popular belief, and electric motorcycle is NOT silent, but is CONSIDERABLY quieter than a typical gas cycle. The cycle is GEARED to 45 mph, has fairly good acceleration, no clutch or transmission.

Volta Laboratory and Bureau The Volta Laboratory, also variously known as the "Alexander Graham Bell Laboratory", the "Bell Carriage House" and the "Bell Laboratory", plus the Volta Bureau, were created in Georgetown, Washington, D.C. by Alexander Graham Bell.[3] The Volta Laboratory was founded in 1880–1881 with Charles Sumner Tainter and Bell's cousin, Chichester Bell,[4] for the research and development of telecommunication, phonograph and other technologies. Using funds generated by the Volta Laboratory, Bell later founded the Volta Bureau in 1887 "for the increase and diffusion of knowledge relating to the deaf", and merged with the American Association for the Promotion and Teaching of Speech to the Deaf (AAPTSD) in 1908.[5] It was renamed as the Alexander Graham Bell Association for the Deaf in 1956 and then the Alexander Graham Bell Association for the Deaf and Hard of Hearing in 1999.[6]

How to Build a Supercomputer on the Cheap Have $300 million to spare? You can do something pretty awesome with all that scratch, like build a new data center in the Arctic Circle. That’s what Facebook (FB) did with its hundreds of millions and ended up with the world’s most efficient computing center. Yay.

Quadcopter build log 1. Introduction This page will be a walktrough on the creation of my quadcopter. Efficiency and Beauty in an Underground Mountainside Hotel Architect Matteo Thun has designed this striking eco-friendly hotel to be located on a mountainside in the National Park of Stelvio in the Italian Alps. Composed of a series of underground buildings linked by undulating green roofs, the complex takes advantage of passive design principles and ground-source heat pumps to conserve energy. In addition, the construction of the units, the way the units are situated on the site, and the materials used have all been carefully considered to minimize the complex’ impact upon the environment. The hotel is comprised of eleven individual units, each appearing as no more than a slight rise in the ground with a large, south-facing window protruding from the hillside.