One of the most intriguing and enduring scientific challenges is to find an explanation for ball lightning, the shining fireballs that sometimes appear near lightning strokes. Although many theoretical ideas have been proposed and much experimental work has been performed, there is not yet an accepted explanation of their amazing properties. They are surprisingly stable, lasting up to 10 s, eve...

The recent demonstrations at Gallaudet University did more to launch deafness and deaf culture onto the national scene than any event since the release of the 1986 film Children of a Lesser God. Media reports of hour-by-hour dramas unfolding on the campus, culminating in a shutdown of the university, evoked in many people's minds the student revolution of the 60s. But in the hearing world, from...

It is difficult to overstate the complexity of assessing risks from chemical mixtures. For every valid reason to assess risks from mixtures, there appears an equally valid question as to whether it is possible to do so in a scientifically rigorous and relevant manner. Because so few data exist for mixtures, current mixture assessment methods must rely on untested assumptions and simplifications...