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 of the most outlandish. Prediction 1: Tesla will achieve full self-driving “next year” Reality: Next year never comes Arguably Musk’s most notorious promises are his constant claims…

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