Neutrino oscillation

In June 1998, Takaaki Kajita of the University of Tokyo presented strong evidence that neutrinos behave differently than predicted by the Standard Model of particles: The three known types of neutrinos apparently transform into each other, a phenomenon known as oscillation.

Shielding

Shining Cherenkov's light on Vavilov

The article on Cherenkov light in “Explain it in 60 seconds” (Aug 09) provides a concise and helpful explanation of Cherenkov radiation to readers.

Don't make us guess

In the latest symmetry, I read that, “The two-mile-long linear accelerator at SLAC National Accelerator Laboratory is the second-longest building in the world.” OK. I give up. You opened the question and gave no answer: What is the longest building in the world now?