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The traveling salesman problem is a favorite math conundrum: if a salesman has to visit a ____1____ of cities, how do you get him to all of them once via the shortest possible route. But the trav...
科學(xué)60秒:別帶有色眼鏡看待外來物種
___1___. And you shouldn’t judge a species by its place of origin. So say ecologists in a commentary in the journal Nature. They argue that conservationists should assess organisms based on the...
科學(xué)60秒:質(zhì)量標(biāo)準(zhǔn),不標(biāo)準(zhǔn)
In a laboratory vault outside Paris is a small cylinder of platinum–iridium alloy that ___1___ the standard for all mass measurements worldwide. By an 1889 international accord, the mass of this
杜拜經(jīng)歷金融疼痛(1)
迪拜陷入財(cái)務(wù)困境 Hints: Dubai Nakheel United Arab Emirates Abu DhabiIn recent years, a shining city grew in the desert of Dubai on -- and even off -- the Gulf coast. An island shaped like a palm ...