'Tis the Season for Endorsements

Fear not, this is not about politics. It’s October, which is the time of year various physics blogs I read vie for your hard-earned money to support some worthy classroom projects through DonorsChoose. Rather than run a separate campaign against blogs that are in consortia and have wider readerships, I will merely point you toward them, and I will be donating through one of them.

The first announcement I have seen is from Dot Physics: It’s That DonorsChoose Time of the Year, and a post at Uncertain Principles has just appeared

Update: The Bad Astronomer also has a donation page

Super, Man

Faster than a speeding photon? Precursors test whether light can be faster than light

While we wait [for neutrino analysis], it is worth noting that in June 0f 2011 a group of researchers performed an experiment to see if light itself could move faster than light! In particular, the scientists used a little known optical phenomenon known as an optical precursor to see if individual photons might travel faster than while propagating in a material. In the end, the experiment suggests that these single photons did not in fact violate Einstein’s speed limit, though the results still got a significant amount of press.

Freeze Doesn't Mean Stop

Laser light used to cool object to quantum ground state

For the first time, researchers at the California Institute of Technology (Caltech), in collaboration with a team from the University of Vienna, have managed to cool a miniature mechanical object to its lowest possible energy state using laser light. The achievement paves the way for the development of exquisitely sensitive detectors as well as for quantum experiments that scientists have long dreamed of conducting.