Today the Tesla Motor Company announced that they had begun regular production of the Roadster, the all-electric supercar that does zero-to-60 in less than four seconds.

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The last few years have seen tremendous growth in solar thermal power plants—huge arrays of mirrors that concentrate the sun's energy onto a liquid which then boils and spins a turbine. The process is generally more efficient than using photovoltaic panels, and new solar thermal plants under construction in Spain and Australia will be among the largest capacity solar plants in the world. Old-fashioned PV panels were starting to look archaic, or at least suitable only for small-scale projects like roof instillations. But not all PV panels are created alike.

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Yesterday morning, 5 am: Oh s***. I'm done for. The viral infection so potent it fells healthy 20-somethings for a week at a time, the epidemic so ubiquitous in our New York offices that it's now referred to simply as the PopSci Plague, the flu that crushes your brain and blows it through your digestive tract has finally come for me. It is my time. I can feel it: A sore throat and vague headache that are the opening salvos of a dispiriting scorched-earth campaign. It's too late to fight.

Or is it?

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It's going to be at least another two decades before any commercial models are built, but researchers are at work designing the Generation IV nuclear reactors. Unlike the generation II and III models now in use that use water to cool and control the fission (preventing runaway reactions, subsequent meltdowns and the environmental apocalypse that would result), the leading contender for cooling material for the Gen IV reactors is molten sodium. Not sodium chloride (plain, unreactive table salt), but sodium metal.

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A panel convened by the National Academy of Engineering announced today a list of the most important projects in the world—at least, what would be, were we to figure out how to build them. The 14 priorities range from economical solar power—we only need to harness 1/10,000th of the sunlight that hits Earth to satisfy the world's energy needs—to reverse-engineering the brain and universal access to clean water (see the full list after the break). They're also introducing a slick new website to solicit public opinion. What do you think is the most important engineering challenge for the century to come?

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Day 1,464 of the Mars rovers' 90-day mission to Mars (for those of you keeping track), and Steve Squires, the head of science operations for the Spirit and Opportunity rovers is getting us up to date on their latest findings. Most important: serendipity in action. The Spirit rover's right front wheel has broken, so engineers turn the rover around, drive it in reverse, and drag the wheel behind the rover. As it slogs across the planet, it carves a trench. And my, what a trench it carves.

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Running the hot water for five minutes burns as much energy as leaving a 60W light bulb on for 14 hours, according to Peter Gleick of the Pacific Institute.

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"Cellulosic ethanol technology is a lot closer to reality than a lot of articles would have you think," said Jacques Beaudry-Losique, manager of the Department of Energy's Biomass Program this morning at the American Association for the Advancement of Science meeting. After some well-publicized studies stated that corn-based biofuels might exacerbate CO2 damage to the environment, focus has shifted to these so-called "second generation" biofuels that use non-food crops such as switchgrass, wood chips or crop residues (e.g. all the parts of the corn plant that are currently wasted after harvest--the stalk, leaves and "cob").

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The idea that a presidential debate focused on science will advance the cause of science "is more magical thinking than scientific," according to a new essay by David Goldston in the journal Nature. Momentum around such a debate has been growing since December, when a grassroots, nonpartisan group called Science Debate 2008 started a petition that called for a "public debate in which the U.S. presidential candidates share their views on the issues of The Environment, Medicine and Health, and Science and Technology Policy." The petition now has many thousand signatories [full disclosure: they include both myself and the editor-in-chief of Popular Science, a.k.a. my boss].

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The annual American Association for the Advancement of Science conference covers arguably the greatest variety of subjects of any science conference in the world. This year's gathering, held in St. Louis, Missouri, hosted symposia on everything from astrobiology to veterinary ethics. And although it's impossible for one reporter to cover more than a small fraction of the 200-plus scientific sessions held over five days, here are a few highlights of the most exciting research happening now.

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