Parag Agrawal, who was appointed this week as Twitter's CEO, has joined at least a dozen other Indian-born techies in the corner offices of the world's most influential Silicon Valley companies. Microsoft's Satya Nadella, Alphabet's Sundar Pichai, and the top bosses of IBM, Adobe, Palo Alto Networks, VMWare and Vimeo are all of Indian descent. Indian-origin people account for just about 1% of the US population and 6% of Silicon Valley's workforce - and yet are disproportionately represented in the top brass. Why? "No other nation in the world 'trains' so many citizens in such a gladiatorial manner as India...