Elon Musk’s 7 most preposterous predictions

Elon Musk is a big brain par excellence. The tycoon has cultivated the image of a renaissance man with the credentials — and the cash — to solve the world’s biggest problems. The 50-year-old last month unveiled another bold target: using brain implants to cure tinnitus within five years.  Skeptics suspect the timelines are unrealistic — because they always are. The world’s richest person has compiled a cornucopia of grandiose predictions. Here are seven o