The other speaker may be the sarcast's present interlocutor, an absent third person, or a conventional attitude.

Choanoflagellates are plankton: tiny protozoans that feed on even tinier bacteria.

Using three-dimensional seismic and well data from the northern North Sea, we describe a large (10 km³) body of sand and interpret it as extrusive.

Morale is an important quality in soldiers. With good morale they'll charge into a hail of bullets; without it they won't even cross a street.