Scale Analysis VS Magnitude Comparisons

There are some subtle facts about scale analysis that make it more powerful than simply comparing orders of magnitude. A most remarkable example is that scale analysis can be applied, through a systematic use of dimensions, even when the precise equations governing the dynamics of a system are not known. The great physicist G. I. Taylor, a character whose prolific legacy haunts any aspiring scientist, gave a famous demonstration of this deceptively simple approach. In the 1950s, back when the...

 An Exercise for Cultivating a Positive Outlook on Life

It's possible to change your cognitive bias by training the brain to focus more on the positive than on the negative. In the lab, Dr. Fox showed subjects pairs of images, one negative (the aftermath of a bomb blast, say) and one either positive (a cute child) or neutral (an office). Participants were asked to point out, as quickly as possible, a small target that appeared immediately after each positive or neutral image—subliminally requiring them to pay less attention to the negative images,...

 Nuclear Bombs End Large-Scale Warfare

The last few centuries have seen the world freed from several scourges—slavery, for example; death by torture for heretics; and, most recently, smallpox. I am optimistic enough to believe that the next scourge to disappear will be large-scale warfare—killed by the existence and nonuse of nuclear weapons.