It can be shown that the set of hyperbolic codirections consists of distinct pairs of oppositely-directed convex cones.

This final stage is characterized by the cooling and resolidification of the partially molten diapir within the mantle, slow subsidence at the surface, and greatly diminished rates of crustal addition.

I always try to keep up with (or keep up on) current affairs.

It is now clear that the Prussian-blue-positive haemosiderin granule of the light microscopist represents either a large siderosome, a clump of smaller siderosomes or compounds siderosomes.