"I don’t teach chemistry. I want students to enjoy it and be confident," says the 63-year-old who retired from the Bhabha Atomic Research Centre’s (BARC) radio-isotopes wing in 2000. Last year, he set up Rasayan Bharati with the idea of popularising science among students in urban and rural Maharashtra. So far, he’s held demonstrations in local schools and conducted several workshops. He also runs a Practicals Club on weekends at his house.