Srinath Perur finished his doctoral work in computer science and, for a change, began a column that answered children’s questions on science. He found himself doing more research than ever to fend off queries about why dogs chase cars and whether there is such a thing as a consequence-free post-meal headstand. He now writes on a variety of subjects, often related to travel and science. He is the author of If It’s Monday It Must Be Madurai, a book about travelling with groups. He lives in Bangalore.