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Human males hying with their moms may not expect to have much luck hooking up this Valentine"s Day. 1 among the northern Muriqui monkeys, males that spend the most time around their mothers seem to get a(n) 2 boost when mating time rolls around.The findings, published in theProceedings of the National Academy of Sciences USA, suggest that females in some species 3 have evolved to play a critical role in their sons" reproductive 4 . Karen Strier, the paper"s lead author and a professor at the University of Wisconsin-Madison, says the paper " 5 " the so-called grandmother hypothesis, a concept 6 human females evolved to live past their 7 reproductive years to spend more time 8 offspring.The research team observed and 9 genetic data from a group of 67 wild monkeys living in a protected reserve in Brazil"s Atlantic Forest: infants, mothers and possible fathers. They found that six out of the thirteen 10 males they studied spent more time around their mothers 11 would be expected by chance. These same six monkeys, on 12 , reproduced the greatest number of offspring.The investigators are still trying to 13 out why. "It"s not like we see moms intervening and helping their sons out," Strier says. "Maybe 14 sitting near their moms, they get to see when females are 15 active, or maybe they just get more familiar with other 16 ."The findings can 17 with future conservation efforts for the critically 18 animals. Strier says, "the 19 tiring we would want to do is 20 a male out of the group where it was born."
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大多数专家认为，越来越多的国家和恐怖组织会在技术上具备获得并使用生化武器的能力。但敌对国家或恐怖组织使用这些武器的情况并不是不可避免的。即使在血淋淋的常规战争中打得难分难解，那些动过念头的国家也不敢轻易使用这些武器，他们担心敌人会以牙还牙地报复或在其他地方使战斗升级激化。而对恐怖组织来说，有技术能力的往往缺乏使用的兴趣，对生化武器有兴趣的却又缺乏必要的技术能力。 然而，评估未来的危险不能简单地从过去推知。敌对国家及恐怖组织使用生化武器的可能性在不断增加，而且毫无保护的人群哪怕遭受一次这样的袭击，其后果也显然是毁灭性的。
Human males hying with their moms may not expect to have much luck hooking up this Valentine"s Day. 1 among the northern Muriqui monkeys, males that spend the most time around their mothers seem to get a(n) 2 boost when mating time rolls around.The findings, published in theProceedings of the National Academy of Sciences USA, suggest that females in some species 3 have evolved to play a critical role in their sons" reproductive 4 . Karen Strier, the paper"s lead author and a professor at the University of Wisconsin-Madison, says the paper " 5 " the so-called grandmother hypothesis, a concept 6 human females evolved to live past their 7 reproductive years to spend more time 8 offspring.The research team observed and 9 genetic data from a group of 67 wild monkeys living in a protected reserve in Brazil"s Atlantic Forest: infants, mothers and possible fathers. They found that six out of the thirteen 10 males they studied spent more time around their mothers 11 would be expected by chance. These same six monkeys, on 12 , reproduced the greatest number of offspring.The investigators are still trying to 13 out why. "It"s not like we see moms intervening and helping their sons out," Strier says. "Maybe 14 sitting near their moms, they get to see when females are 15 active, or maybe they just get more familiar with other 16 ."The findings can 17 with future conservation efforts for the critically 18 animals. Strier says, "the 19 tiring we would want to do is 20 a male out of the group where it was born."
What does the hamburger say about our modern food economy A lot, actually. Over the past several years Waldo Jaquith intended to make a hamburger from scratch, to no avail. "Further 21 revealed that it"s quite impractical— 22 impossible—to make a hamburger from scratch," he writes. "Tomatoes are in season in the late summer. Lettuce is in season in spring and fall. Large mammals are 23 in early winter. The process of making 24 burger would take nearly a year and would inherently involve omitting some core hamburger 25 ."That the hamburger—our delicious and comforting everyman food—didn"t 26 100 years ago is a greasy, shiny example of all that is both right 27 wrong with our modern food economy. 28 fertilizers, genetically modified crops, concentrated farming operations and global overnight shipping, much of the world was lifted out of starvation 29 it could finally grow 30 quantities of food with decreasing labor 31 .But these same advances 32 allow food to be grown out of 33 and in all comers of the globe contribute to a whole host of environmental 34 . The "industrialization of food," as author Paul Roberts puts it, is an endless cycle driven by very small price 35 that force food processors to 36 more advanced techniques to produce even more food 37 lower prices. This system will only be aggravated as food demand 38 . Recently David Tilman and Jason Hill of the University of Minnesota released a study 39 that global food demand could double by 2050. It"s 40 that our current, impractical food economy can sustain that demand.
Human males hying with their moms may not expect to have much luck hooking up this Valentine"s Day. 1 among the northern Muriqui monkeys, males that spend the most time around their mothers seem to get a(n) 2 boost when mating time rolls around.The findings, published in theProceedings of the National Academy of Sciences USA, suggest that females in some species 3 have evolved to play a critical role in their sons" reproductive 4 . Karen Strier, the paper"s lead author and a professor at the University of Wisconsin-Madison, says the paper " 5 " the so-called grandmother hypothesis, a concept 6 human females evolved to live past their 7 reproductive years to spend more time 8 offspring.The research team observed and 9 genetic data from a group of 67 wild monkeys living in a protected reserve in Brazil"s Atlantic Forest: infants, mothers and possible fathers. They found that six out of the thirteen 10 males they studied spent more time around their mothers 11 would be expected by chance. These same six monkeys, on 12 , reproduced the greatest number of offspring.The investigators are still trying to 13 out why. "It"s not like we see moms intervening and helping their sons out," Strier says. "Maybe 14 sitting near their moms, they get to see when females are 15 active, or maybe they just get more familiar with other 16 ."The findings can 17 with future conservation efforts for the critically 18 animals. Strier says, "the 19 tiring we would want to do is 20 a male out of the group where it was born."
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