To the Editor: Sleep disordered breathing (SDB) is underdiagnosed in children and difficult to differentiate from attention deficit hyperactivity disorder (ADHD). Both may present with similar symptoms of inattention, hyperactivity, irritability, and daytime sleepiness. Sleep disordered breathing includes primary snoring or obstructive sleep apnea, which are surprisingly common among children w...

Models ofocean circulation and biogeochemical cy les are used to speculate bout possible m chanisms of deep-sea anoxia across the Pertoo-Triassic boundary. Two modes of likely Late Permian ocean thermohaline circulation are identified: a vigorous "therm',d mode" driven by cooling in southern polar latitudes and aweaker "haline mode" driven by evaporation fromthe subtropics. We find that the the...

Ossification of the Achilles tendon (OTA) is an unusual clinical condition. It is characterized by the presence of an ossified mass within the fibrocartilaginous substance of the Achilles tendon. The etiology of the ossification of the Achilles tendon is unknown. Review of the literature suggests that its etiology is multifactorial. The major contributing factors are trauma and surgery with oth...

The observed strong remanent crustal magnetization at the surface of Mars suggests an active dynamo in the past and ceased to exist around early to middle Noachian era, estimated by examining remagnetization strengths in extant and buried impact basins. We investigate whether the Martian dynamo could have been killed by these large basin-forming impacts, via numerical simulation of subcritical ...