Economic Times: Steven Chu was awarded the 1997 Nobel Prize in physics jointly with compatriot William D Phillips and Claude Cohen-Tannoudji of France for "developing methods to cool and trap atoms with laser light". Chu is now better known as US President Barack Obama's former energy secretary, a post he resigned from in April to return to Stanford University. An advocate of sustainable development and renewable energy, Chu speaks to Narayani Ganesh on the sidelines of the Lindau Nobel Laureate Meetings with young...