Tony Spear never would have achieved his breakthrough by taking incremental steps. He did it by facing his fears and facing down the parade of experts who discouraged him along the way. So if you’re interested in solving grand challenges, driving breakthroughs, and changing the world, you’ll need to get ready. Go to the gym, start working out your fearlessness muscles and thickening your skin against the rain of criticism to come. Most importantly, do not seek to change the world unless you seek it, to paraphrase the nineteenth-century Indian mystic Sri Ramakrishna, “as a man whose hair is on
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