There are games with steep learning curves, and then there are Paradox Interactive games. Equally part glorified-spreadsheets and part history simulators, Paradox games ask and offer a lot to ...

Now physicists have found the first evidence of pentagonal ice crystals. The unusual rod-like ice crystals were formed on a copper surface in an ultrahigh vacuum at temperatures of -173 °C.

Ice has rarely been viewed at the nanoscale before and the team discovered a one-dimensional chain structure built from pentagon-shaped rings, rather than the more commonly seen hexagonal ...