Anna Sale fills in for Leonard Lopate. On today’s show: Mary Roach joins the Leonard Lopate Show Book Club to talk about her book Gulp! Thomas Piketty talks about crunching 200 years’ worth of economic data to look ahead at how wealth will be distributed in the 21st century. Cecile Richards talks about her late mother, former Texas Governor Ann Richards. James Moll discusses his documentary “Farmland,” about the lives of young farmers and ranchers. And we’ll find out why there isn’t a male contraceptive pill.