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FAITH LAPIDUS: This SCIENCE IN THE NEWS program was written by Jerilyn Watson. Our producer was June Simms. I’m Faith Lapidus.

BOB DOUGHTY: And I’m Bob Doughty. You can find transcripts, MP3s and podcasts of our programs at voaspecialenglish.com. And you can find us on Twitter and YouTube at VOA Learning English. Join us again next week for more news about science in Special English on the Voice of America.