Huge 3D printer, More sleep, Question intonation

00:58 Huge 3D Printer Aims to Cut Building Time, Labor Costs
05:43 Health & Lifestyle: Study: Most Americans Need More Sleep
11:04 Discussion: the term ‘responding’ and getting enough sleep
14:00 Five Tips to Get Better Sleep
19:06 Lesson of the Day: intonation and question words
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