On today’s show: Joel Brinkley, who won the Pulitzer Prize for his coverage of the fall of the Khmer Rouge in Cambodia in 1978, tells us what he found when he returned to the country three decades later. Philip Kerr discusses his noir thriller about an anti-Nazi P.I. hiding in Cuba, Field Gray. We’ll speak with two winners of this year’s “Women of Discovery” awards. Plus, Please Explain is all about hormone replacement therapy.