notion of “computable” — i.e., to isolate the general structure of the computing process itself. The danger we face is that the various types of computability, as defined here, will say more about the individual languages that gave rise to them than they do about this general structure. But anyone who is familiar two or more languages will realize that this difficulty is more one of principle t...

Social psychologists have shown human decisions to be sensitive to numerous ordinary, possibly nonconscious, situational contingencies, motivating the view that control is largely illusory, and that our choices are largely governed by such external contingencies. Against this view is evidence that self-control and goal-maintenance are regularly displayed by humans and other animals, and evidenc...

Social life consists of making mistakes, then correcting them. The big questions do not concern who makes the fewest mistakes and why, but whether the mistakes are fruitful, how fast people recognize them, and how well they correct them. The same principles apply to writing books, even if the interaction and error-correction take longer to operate than in everyday conversation. This symposium’s...

Efficient conversion of “mixing energy” to electricity through capacitive mixing (CapMix) has been limited by low energy recoveries, low power densities, and noncontinuous energy production resulting from intermittent charging and discharging cycles. We show here that a CapMix system based on a four-reactor process with flow electrodes can generate constant and continuous energy, providing a mo...

This Addendum provides a revised set of figures containing converged numerical data for total scattering cross section (TSCS), replacing the figures in our recent publication [Opt. Lett. 29, 1393 (2004)]. Due to the use of an overly large time step, our original TSCS data exhibited a systematic, nonphysical diminution above 150 THz for all cases studied. We have determined that numerical conver...