Drones(无人机) can do a lot of things for us, taking photos, delivering(投递) things from packages to pizzas or beer and following wild animals. But they have other uses now.
Can you believe it? Drones can serve(服务)people coffee. US company IBM has made this kind of drone. It can deliver coffee to sleepy people. The drone can know when to bring a cup of coffee by studying a person's personal data(个人资料). Then the drone will fly to the person. There is a special device(设备)under the drone. It helps the drone give people coffee. The drone can also learn about someone's coffee-drinking habits and predict when he needs his next cup of coffee.
Drones can also save lives. One company in Africa use drones to deliver medicine and blood fast and save many people's lives. The drones are able to fly at speeds of up to 60 miles per hour and when they are near the destination(目的地), the doctors receive a text and wait nearby. The drones drop off the packages and then return home.
Once a 92-year-old hunter in Virginia was lost and had to spend a night in the woods. The police searched for him all night but failed to find him. Luckily a drone tracked him down(追踪到他) in 20 minutes. Also, drones helped the firefighters know about the fire in wildfire fight.
