A small soft robot composed of strategically magnetized polymers could one day find its way into human bodies.

These robots are the first of their kind to be able to transport and release up to four different drugs in precise, reprogrammable sequences.

China’s halt this month on exports of magnets containing heavy rare earth metals has affected Tesla’s plans to manufacture Optimus robots. By Keith Bradsher Reporting from Shanghai Elon Musk, the ...