Blog 070621: Gukov

3-manifolds $M$	Algebraic number fields $K$
$H^{n}(M)$	$H_{et}^{n}(\operatorname {Spec} {\mathcal {O}}_{k},G_{n})$ (vanishes for $n>3$)

More at http://www.ctqm.au.dk/June2007/video.html