ALTHOUGH Fauvel, 1 in 1843, attributed the apical presystolic murmur to stenosis of the mitral valve, Duroziez's 2 description — "ffout-tata-rou" — in 1862 has been considered as the classic ...

Precise underwater navigation is critical for autonomous and remotely operated deep-sea vehicles, yet variations in seawater sound speed often introduce systematic acoustic positioning errors.

Getting a good night’s sleep is hard. A third of all American adults report getting less than the daily recommended amount of sleep nearly every night. Too little noise, and the mind starts to race.