A new result for the production cross section of Z boson pairs in proton-antiproton collisions at the 2-TeV Tevatron collider is now public, thanks to the efforts of the CDF collaboration. The measurement, in a nutshell, confirms Standard Model predictions nicely: the cross section is determined to be 1.45 picobarns, with an asymmetric error bar of of +0.60-0.51. The Standard Model, on the other hand, predicts that the cross section is 1.21 picobarns. The agreement of the two numbers, within uncertainties, says that all is well in the searched final state, and no unforeseen effects are at work.

SNR B0509-67.5 (or SNR 0509 for short) appears to float serenely in the depths of space, but this apparent calm hides an inner turmoil. The gaseous envelope formed as the expanding blast wave and ejected material from a supernova tore through the nearby interstellar medium.  SNR B0509-67.5 is the visible remnant of a powerful stellar explosion in the Large Magellanic Cloud (LMC), a small galaxy about 160 000 light-years from Earth.

Ripples seen in the shell's surface may be caused either by subtle variations in the density of the ambient interstellar gas, or possibly be driven from the interior by fragments from the initial explosion. The bubble-shaped shroud of gas is 23 light-years across and is expanding at more than 18 million km/h.

In the 1990s, virtually everyone except those closest to environmental issues knew biofuels were a bad idea in their current incarnation.   But evangelists like Al Gore insisted they were the future and concerns about what it would do to the food supply for poor people went unheeded.

Now we know - at least in ethanols based on that technology, biofuels are worse for the environment and made food more expensive and Mr. Gore has said he made a mistake endorsing them to garner support for his presidential race but once government policies - and therefore lobbyists - are in place, it is hard to turn back.

Depression in young people strongly predicts how aggressive and violent they may be or may become, but exposure to violence in video games or on television is not related to serious acts of youth aggression or violence, at least among Hispanics in the U.S. according to new research by Dr. Christopher Ferguson from Texas A&M International University. 

Violence in media and the potential negative effects on adolescent antisocial behavior, and youth violence in particular, is a highly debated issue, both in academic circles and among the general public and policy makers but the research is inconclusive largely due to methodological problems.

Some metaphors are difficult to explain - if you have a child and use one and get asked what it means, and then get asked what the definition means, you know what we...mean...see how hard it can be to communicate?

They're even more difficult in sign language and a recent study on the use of metaphors in spoken language and various sign languages looks into the issue.  The recent paper by Irit Meir of the University of Haifa examines the interrelations between two notions that play an important role in language and communication, iconicity and metaphor.

The pharmaceutics industry, too many science bloggers, “skeptics” - they all tell us that we should trust science and that all those who speak out for “natural” solutions are none other but religious idiots, or even monsters, criminals who do not refrain from harming your child for financial benefit. They try to bang it into our heads: Also nature is just chemistry; the often not applicable always-been-there-anyways-argument.

As I explained with help of the example of the vitamins E and D, the “tree huggers” often get it right plainly by staying “natural”.