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Najat Rochdi, de la Minusca : " En Centrafrique, il y a bien des volontés de massacre sur des bases ethniques et religieuses "
Des officiers africains à la tête des forces de paix sur le continent, nouvelle règle ou exception ?
Alex Jones and fans of homeopathy may have something in common.
Jones’ wildly popular supplements, sold on his Infowars.com site, are nothing more than humdrum vitamin blends that have little-to-no data supporting touted health benefits—basically the same as the vitamins found in any pharmacy or health store, according to independent lab testing. But there are two key differences: the far-right talk show hosts’ supplements are far more expensive and they tend to be weaker than garden-variety supplements. Reminiscent of the extensively watered-down treatments used by homeopaths, Jones’ supplements were often diluted such that even if those vitamin and herbal blends did offer some health benefits, the doses would likely be too small to be effective.
That’s all according to an independent lab analysis performed on several of the supplements by Labdoor, a San Francisco-based lab that tests dietary supplements. The analysis was done at the behest of BuzzFeed News, which reported the results late Wednesday.
Almost everyone recognizes that if humans are truly to go deeper into the Solar System, we need faster and more efficient propulsion systems than conventional chemical rockets. Rocket engines powered by chemical propellants are great for breaking the chains of Earth's gravity, but they consume way too much fuel when used in space and don't offer optimal control of a spacecraft's thrust.
NASA recognizes this, too. So in 2015, the space agency awarded three different contracts for development of advanced propulsion systems. Of these, perhaps the most intriguing is a plasma-based rocket—which runs on Argon fuel, generates a plasma, excites it, and then pushes it out a nozzle at high speed. This solution has the potential to shorten the travel time between Earth and Mars to weeks, rather than months.
But to realize that potential, Houston-based Ad Astra Rocket Company must first demonstrate that its plasma rocket, VASIMR, can fire continuously for a long period of time. The three year, $9 million contract from NASA required the company to fire its plasma rocket for 100 hours, at a power level of 100 kilowatts, by 2018.
With a jolt from a tiny chip, humdrum skin cells may transform into medical mavericks.
A small electrical pulse blasts open tiny pores in the cells and zaps in fragments of DNA or RNA loaded in the chip’s nanochannels. Those genetic deliveries can then effectively reprogram the skin cells to act like other types of cells and repair damaged tissue. In early experiments on mice, researchers coaxed skin cells to act like brain cells. They also restored blood flow to a rodent’s injured limb by prompting skin cells to grow into new blood vessels.
The technology, published this week in Nature Nanotechnology, is still a long way from confirmed clinical applications in humans. But, the Ohio State researchers behind the chip are optimistic that it may one day perform myriad medical feats—including healing severe injuries, restoring diseased organs, erasing brain damage, and even turning back the clock on aging tissues.