The empty set may seem a bit feeble, but appearances deceive; it provides a vital building block for the whole of mathematics.
As nonconventional medical treatments become increasingly mainstream, we take a look at the science behind some of the most popular.
It is very much worth checking out an item on Real Climate, from two Dutch scientists. They have found a paper by James Hansen and others from 1981, before climate change was even an occasion for political disagreement.Hansen is now famous in the world of climate studies, and infamous to the right wing, but back then he was a 40-year-old…
Could the United States establish a moon colony and develop a new propulsion system for going to Mars? All within eight years of a Newt Gingrich presidency, as Mr. Gingrich promised this week? The answers seem to be technologically yes, economically iffy and politically very difficult. In proposing an ambitious vision for space, Mr. Gingrich…
A small study raises more concern about the long-term consequences of brain injuries suffered by thousands of soldiers — suggesting they may be at risk of developing the same degenerative brain disease as some retired football players. Autopsies of four young veterans found the earliest signs of chronic traumatic encephalopathy, or CTE, in their brain…
“Shocking” find may redraw picture of solar system’s cosmic shield.
A novel form of renewable energy can generate electricity from waste-water treatment