<div dir="ltr"><div class="gmail_default" style="font-family:"comic sans ms",sans-serif;font-size:small;color:rgb(0,0,0)">​<a href="http://www.nature.com/articles/nature18933.epdf?referrer_access_token=yW7fYJJ13ccJ1n-3a7WNkdRgN0jAjWel9jnR3ZoTv0O0Lx4Tw9Skr3oFpihwmWy3rOpIR_PgsKSYzJ0kckcyZVubMoWVn1F0nPCMpkB1956MF9lJEiw5_Q413j8UGvT7SIN0e02T4Cn8tL2UHeDImhhy_GhryTlsNa_uqdKFa14Wkxg0t0gqeZQoPECHuwq9q7xiR-xN6-eH5NoR2XjA4otezYYUPvflTVV0nrx-Ljtpfwe4YQ-fcHyoFzPRNF7xqKCLjUdLd-jmO4tjv0a7gGTBMxhxnTc_2Xo1BE_tn5c%3D&tracking_referrer=www.nytimes.com">http://www.nature.com/articles/nature18933.epdf?referrer_access_token=yW7fYJJ13ccJ1n-3a7WNkdRgN0jAjWel9jnR3ZoTv0O0Lx4Tw9Skr3oFpihwmWy3rOpIR_PgsKSYzJ0kckcyZVubMoWVn1F0nPCMpkB1956MF9lJEiw5_Q413j8UGvT7SIN0e02T4Cn8tL2UHeDImhhy_GhryTlsNa_uqdKFa14Wkxg0t0gqeZQoPECHuwq9q7xiR-xN6-eH5NoR2XjA4otezYYUPvflTVV0nrx-Ljtpfwe4YQ-fcHyoFzPRNF7xqKCLjUdLd-jmO4tjv0a7gGTBMxhxnTc_2Xo1BE_tn5c%3D&tracking_referrer=www.nytimes.com</a></div><div class="gmail_default" style="font-family:"comic sans ms",sans-serif;font-size:small;color:rgb(0,0,0)"><br></div><div class="gmail_default" style="font-family:"comic sans ms",sans-serif;font-size:small;color:rgb(0,0,0)">Way of my league but of interest to some on this list, I think.</div><div class="gmail_default" style="font-family:"comic sans ms",sans-serif;font-size:small;color:rgb(0,0,0)"><br></div><div class="gmail_default" style="font-family:"comic sans ms",sans-serif;font-size:small;color:rgb(0,0,0)">bill w​</div></div>