On today’s podcast, the University of Maine builds the largest 3D printer; researchers say American need more sleep followed by a discussion on the term ‘responding’ ; five tips to get better sleep; then, intonation and question words on Lesson of the Day.

On today’s podcast, a special essay about the Ukrainian town of Berdychiv; NASA has discovered methane coming from an area on Mars followed by a discussion about why scientists are interested in the gas; then, find out about English homophones on Lesson of the Day.