For those interested (and with subscriptions or institutional access), here are the abstracts for the two papers, the first from the MIT group and the second fr

For those interested (and with subscriptions or institutional access), here are the abstracts for the two papers, the first from the MIT group and the second from the Princeton group: http://www.sciencemag.org/content/early/2015/07/15/science.aaa9273.abstract?sid=31d8c875-11ca-4da8-aeeb-32719f4e4395 http://www.sciencemag.org/content/early/2015/07/15/science.a... http://www.sciencemag.org/content/early/2015/07/15/science.aaa9297.abstract?sid=31d8c875-11ca-4da8-aeeb-32719f4e4395 http://www.sciencemag.org/content/early/2015/07/15/science.a... The MIT group's paper appears to be on arXiv: http://arxiv.org/abs/1502.03438 http://arxiv.org/abs/1502.03438 (albeit with a somewhat different abstract; perhaps a pre-acceptance version). Unfortunately the Princeton group's paper doesn't appear to be posted on arXiv.org as of right now.