ENLIGHTENING: Actor R.Sarath Kumar switches on an LED light bulb as part of the run-up to the 99999 lights-out campaign, in Chennai on Sunday. Exnora International Founder M.B.Nirmal is in the picture.

Many industries have not tapped the potential of solar thermal energy: Chunkath

Anil Kumar Sastry

Madhur Tankha NEW DELHI: A group of people besotted with the dark skies are working on a special project these days to measure light pollution in Delhi and some other cities.

Scientists of the Chennia-Tamil Nadu based M S Swaminathan Research Foundation identified 101 edible wild greens. Not all are consumed regularly.