Batsfly,ratherthanglide,andthusaretheonlymammalscapableoftrueflight.

When carbon is added to iron in the proper proportions , the result is steel.

By the nineteenth century, embroidery on men's clothing had virtually disappeared except for the occasional decorative vest and tie.

Solidgeometryhasenabledastronomerstocalculatethepositionsoftheheavenlybodiesrelativetooneanother.

With the acquisition of smaller companies by larger ones, the 1960's saw a wave of new conglomerates.