In 2012, 23andMe launched a $99 consumer-grade genetic testing product that doubled its sales in nine months. As the originator of consumer-grade genetic testing, 23andMe opened the market first, and also spawned and bred a billion-.......

A: Aphids are one of the main insect pests of rape. Before the five-leaf stage, the rape leaves are green and vulnerable to aphids. In the seedling stage, the locusts mostly concentrate on the back of the leaves and suck sap, causing growth stagnation and even death. Chemical control can b.......