The human body constantly generates a variety of signals that can be measured from outside the body with wearable devices.

Many of the world's drone companies use parts from China, but China is cutting some American drone makers off through sanctions, part of its retaliation last month for U.S. tariffs. As NPR's Emily ...

Many of the world's drone companies rely on China for parts. But China is cutting some U.S. drone makers off through sanctions as part of its retaliation for U.S. tariffs. Taiwan says it can help out.