Cumulonimbus

Cumulonimbus

(alt-text)

The rarest of all clouds is the altocumulenticulostratonimbulocirruslenticulomammanoctilucent cloud, caused by an interaction between warm moist air, cool dry air, cold slippery air, cursed air, and a cloud of nanobots.

What If? 2 is now available in paperback in the UK!