VG News: American talk show host David Letterman, who is now helming a documentary series Years of Living Dangerously for National Geographic on climate change and solar energy, interviewed Indian Prime Minister Narendra Modi for an episode. In the preview of the upcoming episode, Letterman says, I am not nervous but very, very excited. This is Modis third exclusive interview since assuming office; the two occasions being on Indian news channels Times Now and CNN-News18. Though the Indian Prime Minister...