Winter is always the best time to visit Kolkata. There&rsquos great food to be had, the stifling humidity dies a quick death, and the local population emerges from the post-Pujo grief, ready for the next round of events. An upcoming one that&rsquos a little offbeat, but highly educational is the Indian International Science Festival (IISF) 2019, slated from November 5 to 8 this year. A STEM-meets-tangible-heritage event being organised at the national level, its theme this year is Indian handicrafts.