科學(xué)60秒:棒球裁判與數(shù)學(xué)結(jié)緣
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...
晨讀美文071
聽寫時忽略標(biāo)題A young man sees a sunset and, unable to understand or to express the emotion that it rouses in him, concludes that it must be the gateway to a world that lies beyond. It is difficu...
世衛(wèi)促各國不要放松防范流感戒備 (2)
“So, that is different than the severity of a pandemic. The severity of a pandemic has to do with when people get infected, how often are they going to develop really severe disease." Dr. Fuku...
長壽之道:對未來充滿希望 (1)
Hints:Hilary Tindle Pittsburgh PennsylvaniaHere is a good reason to be hopeful about the future: it might help you stay alive. Findings from a new study were presented at a recent meeting of the...