  Hydraulic jumps created by gravity are seen every day in the kitchen sink. We
show that at small scales a circular hydraulic jump can be created in the
absence of gravity, by surface tension. The theory is motivated by our
experimental finding of a height discontinuity in spreading submicron molten
metal droplets created by pulsed-laser ablation. By careful control of initial
conditions, we show that this leads to solid femtolitre cups of gold, silver,
copper, niobium and tin.
