Love them or hate them, the mischievous Elf on the Shelf has become a one of the most popular Christmas traditions. But coming up with 24 days of Elf on the Shelf ideas isn't always easy, especially ...

科学家们设计了一种只凭手腕运动就可以抓握物体的机械手。这只由英国剑桥大学研究团队研发的3D打印机械手中被放置了传感器，从而能够 “感知” 它所触摸的物体。 Researchers say their robotic hand can handle items that are currently too delicate for machines. The hand uses wrist ...