David A. Weintraub is Director emeritus of the Communication of Science, Engineering and Technology and Professor emeritus of Astronomy at Vanderbilt University, USA. His books include Is Pluto a Planet?; How Old is the Universe?; Religions and Extraterrestrial Life: How Will We Deal With It?; Life on Mars: What to Know Before We Go; and The Sky is for Everyone: Women Astronomers in Their Own Words (with Virginia Trimble). He is creator and lead editor of a series of scientific autobiographies for children, the Who Me? books.