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谨慎的老左，早已开始安排贝壳的一切_财富号_东方财富网
eastmoney.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from eastmoney.com Daily Mail and Mail on Sunday newspapers.
左晖：一位行业生态变革者的20年；万亿帝国何去何从？左晖已安排好一切？
163.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from 163.com Daily Mail and Mail on Sunday newspapers.
从神秘符号中解密汉字之源 他们这样守住中华文明的根脉_甲骨文
sohu.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from sohu.com Daily Mail and Mail on Sunday newspapers.
四川达州遭遇暴雨 消防紧急营救和转移群众24人
yangtse.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from yangtse.com Daily Mail and Mail on Sunday newspapers.
Pyrethrum: How One of the Oldest Natural Insecticides Keeps Mosquitoes Away
With mosquito season upon us, people are stocking up on repellents to prevent itchy bites. Bug repellents are important because they don’t just protect against the buzzing, blood-sucking little pests they also safeguard against the diseases they carry, which kill some 700,000 people worldwide each year.
Surprisingly, despite widespread use, no one understood exactly how most mosquito repellents keep the insects away. Now researchers are starting to uncover the first pieces of the puzzle.
A new study has identified a scent receptor in mosquitoes that helps them sniff out and avoid trace amounts of pyrethrum, a plant extract used for centuries to repel biting insects.