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An audiophile headphone amp for $219 (but sounds much more expensive)

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(Image: Bottlehead)

The Bottlehead Crack amplifier. 

“This is what we call a Skill Level 1 kit, perfect for first time builders. The circuit is so simple you can build it in an evening or two. A simple circuit also means a low parts count, which keeps the price low, too. Crack is an output transformerless amp designed specifically for running higher impedance (100 ohms or higher) headphones like the many … Read More → "An audiophile headphone amp for $219 (but sounds much more expensive)"

The natural language computer from Star Trek is not that far away from reality

“…with the technology we’re building, they should be able to just type (or say) into an app: “Compare the frequency spectrum for the crankshaft in gears 1 and 5″. Back on the server, Wolfram|Alpha technology will convert the natural language into a definite symbolic query. Then in Mathematica the model will be simulated and analyzed, and the results—quantitative, visual or otherwise—will be sent back to the user. Like a much more elaborate and customized version of what Wolfram|Alpha would do today with a question about a … Read More → "The natural language computer from Star Trek is not that far away from reality"

Contrails are worse than aircraft emissions for the climate

Scientists at NASA have found that cirrus clouds created by contrails from engine exhaust are capable of increasing average surface temperatures enough to cause a warming trend in the United States.

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Image courtesy NASA Langley Research Center

“This enhanced infrared image from the Moderate Resolution Imaging Spectroradiometer (MODIS), aboard NASA’s Terra satellite, shows widespread … Read More → "Contrails are worse than aircraft emissions for the climate"

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