strain+one's+invention
131birth control — regulation of the number of children born through the deliberate control or prevention of conception. Cf. family planning (def. 1). [1914, Amer.] * * * Voluntary limiting of human reproduction, using such means as contraception, sexual abstinence …
132Crossbow — This article is about the weapon. For other uses, see Crossbow (disambiguation). Sketch by Leonardo da Vinci, c. 1500 A crossbow is a weapon consisting of a bow mounted on a stock that shoots projectiles, often called bolts or quarrels. The… …
