Meet Marconi prize-winner Hari Balakrishnan of MIT

Hari Balakrishnan, 51, grew up in Chennai, moved to the US for his PhD studies, and is now a professor at the Massachusetts Institute of Technology (MIT). He recently won the prestigious Marconi prize for his work in communications. This includes helping build congestion-control codes for the internet, and remote-sensing solutions for drones. His most significant invention is a program called CarTel that helps track traffic, driving, and the state of the roads. See what it took to set it up, in a time before smartphones. And how the idea - a simple but revolutionary one - ended up serving millions across 25 countries.
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