<div dir="ltr"><a href="http://science.sciencemag.org/content/361/6403/672.full">http://science.sciencemag.org/content/361/6403/672.full</a><br><div><br></div><div>In which it turns out that sometimes a worker standing idle contributes most efficiently to getting the collective job done.</div><div><br></div><div>-- rec --</div><div><br></div></div>