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清香诱人,浓香驱蚊

Malaria Parasite Attracts Mosquitoes with Perfume

Ever lit a citronella candle to ward off mosquitoes, only to have 'em appear in droves? Well, believe it or not, you may have actually been attracting the bugs. Because while high concentrations of those pine-and-lemon-scented chemicals might repel mosquitoes, at low concentrations they lure the bloodsuckers in.

Audrey Odom, who studies mosquitoes at Washington University, calls it the "Chanel hypothesis." Too much perfume is awful, but a little is pretty nice. Plants take advantage of that to advertise their nectar - because no, mosquitoes don't live on blood alone.

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中产家庭

The Middle S06E01

the-middle

Mom and dad were having a hard time while Axl embraced his "iconic" moment in life - went to college. His sister, Sue, became a peer junior leadership adviser, only to find her ex being someone else's boyfriend.

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好莱坞式三维打印新工艺

What if 3D printing was 100x faster

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What we think of as 3D printing is really just 2D printing over and over slowly. Onstage at TED 2015, he unveils a bold new technique — inspired, yes, by Terminator 2 — that's 25 to 100 times faster, and creates smooth, strong parts. Could it finally help to fulfill the tremendous promise of 3D printing?

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