document.write("«&nbsp;<a href='/news/view?id=87990'>China's Surveillance State Should Scare Everyone</a>");document.write(" | ");document.write("<a href='/news/view?id=87992'>Close geodesics on regular tetrahedra in hyperbolic space. (arXiv:1801.07020v2 [math.MG] UPDATED)</a>&nbsp;»");