On today’s podcast, Chinese researchers develop a robot guide dog for the blind; South Sudan is home to largest mammal migration; a rural student in China gets high marks in a national competition followed by a discussion about the word ‘vocational;’ then, ‘best and worst’ on Lesson of the Day.

On today’s podcast, the U.S. Supreme Court rules that presidents’ official acts cannot face legal action; an ancient ancestor to mammals had a developed brain; heat can harm the body; polite disagreement on Lesson of the Day.