righthandedness

That this should become prescriptive is by no means to be taken for granted, since eating aided by a knife in the right hand to cut bite-size fragments off the food must usually, given righthandedness, involve or have involved handling the food with the left hand, and the use of knife and fork has resulted in a European (cum British) norm of putting food into the mouth with fork held in the left hand, as distinguished from the American norm of using the fork held in the right hand.

1987, Paul Hockings, Dimensions of Social Life: Essays in Honor of David G. Mandelbaum, →ISBN, page 263

Compared with general population samples under the same criteria, and with their own second-degree relatives, non-righthandedness is in fact more frequent in twins and their first-degree relatives.

2005, Isaac Blickstein, Louis G. Keith, Multiple Pregnancy: Epidemiology, Gestation, and Perinatal Outcome, →ISBN

Intuitively, a surface is orientable if there the exists a sense of “righthandedness” and “lefthandedness” that can be defined consistently throughout the whole surface.

2013, William F. Basener, Topology and Its Applications, →ISBN