Cryptorchidism (over 90% in some studies). Even after orchiopexy, these may also affect sperm maturation and motility at an older age. The most common diagnostic dilemma in otherwise normal boys is distinguishing a retractile testis from a testis that will not descend spontaneously into the scrotum. Retractile testes are more common than truly undescended testes and do not need to be operated on. In normal males, as the cremaster muscle relaxes or contracts, the testis moves lower or higher ("retracts") in the scrotum. This cremasteric reflex is much more active in infant boys than older men. A retractile testis high in
From the Earth to the Moon the first recorded use of this term in history. In H. G. Wells' 1901 novel "The First Men in the Moon" (also relating to the first voyagers to the Moon) the protagonist, Mr. Bedford, mentions Verne's novel to his companion, Professor Cavor, who replies (in a possible dig at Verne) that he does not know what Bedford is referring to. Verne returned the dig later when he pointed out that he used gun cotton to send his men to the moon, an actual substance. "Can Mr. Wells show me some 'cavourite'?", he asked archly. The novel (along with Wells' "The