Apparently, this user prefers to keep an air of mystery about them.
12 What is the capture cross-section of a black hole region for ultra-relativistic particles? Jan 27 '13
5 How far apart are galaxies on average? If galaxies were the size of peas, how many would be in a cubic meter? Mar 31 '13
5 'Negative pressure' counteracting gravity? May 11 '13
5 Do partial derivatives commute on tensors? Jan 31 '13