ScienceSpectrum: On their ownTo play this audio please enable JavaScript, and consider upgrading to a web browser that supports HTML5 videoScience11/20/2015November 20, 2015Weapons that think for themselves, encryption technologies blamed for Paris attacks, DNA blood tests for Down syndrome, and a botchy, sputtering start for 3D printing.https://p.dw.com/p/1H9iYAdvertisement Produced and presented by Conor Dillon