Two years ago I discussed the results of a very interesting search performed by the CDF experiment in its dataset of 2-TeV proton-antiproton collisions, provided by the Tevatron accelerator at Fermilab.

The search focused on the hypothesis that a massive fourth-generation quark was produced in the collisions. What was assumed was that the quark was heavy -otherwise previous searches would have found it already-, and that it behaved similarly to the sixth quark, the top, which is by now a well-known animal of the particle zoo.

The matter has indeed been discussed ad nauseam in the recent past. Blog posts, internal discussions, conferences, workshops, other blog posts, threads. But there is always the chance to add some bit of information to the soup, or -more easily- misinformation. In this case, the discussion invests mostly italian blogs, so I figured I would give you a summary here.

I cannot but be happy about the decision of the Australian government led by Kevin Rudd to further tighten the moral suasion against smoking. They decided that starting in 2012, the name of the brand of cigarettes and other logos will be moved away from the front of the pack, making all the packs of cigarettes look equal in their appearance: the one of the picture below. On the left how packs look like now, on the right the new look.

Last Monday Stephen Hawking gave a lecture at the George Washington University for the 50th anniversary of NASA. There he discussed the chance of a contact between our civilization and an extraterrestrial one. And he warned about the risks we may be facing.