Four-sided figures without parallel sides include trapezoids and kites.

The convexity of the Roman Nose is confined to the centre of the Nose, and occasions its aquilineness.

This fabulous fannish cover illustrated the three stages of fandom: the neo, the trufan, and the BNF.

The absolute differential calculus came into prominence as the instrument best fitted for dealing with the general theory of relativity and it has also been found indispensable for the differential geometry of hyperspaces.