We recently featured one way to heat your house with the sun, but DIYer Daniel Strohl has spent three years perfecting his homemade solar garage heater, made out of a wooden box, some vacuum parts, and a lot of empty soda cans.
Comet Lovejoy, seen here in January 2015 -- discovered in August 2014, the two, bright, band-like rays in the tail are unprecedented. This is Australian amateur Terry Lovejoy's fifth comet discovery. And that lovely green color? Comet heads are usually like that; the green glow comes from molecules of diatomic carbon (C2) fluorescing in ultraviolet sunlight in the near-vacuum of space. <3<3<3<3
Researchers are repurposing decades-old technology to build faster gadgets for the future, creating nanoscale vacuum tubes that could dramatically improve the speed and efficiency of personal electronics and solar panels.