The best of the rest from the Physics arXiv this week:

Quantum Imaging: Scattered Observations On "Copenhagen"

Millions of Web surfers have spare computer cycles--why not use browsers to tap them?

Unless a flash ad in one of your open browser tabs has gone rogue, it's likely you've got a few spare processor cycles available on the PC you're using to read this.

A computer model that detects who is influencing whom in a group discussion, can accurately predict who is likely to speak next

One fascinating question that occupies social scientists concerns groups discussions. The problem is to determine the nature of the interaction between individuals and in particular, who influences whom.

People divulge more sensitive information on sites that look less safe.

Researchers at Carnegie Mellon University have found that the appearance of website has a big effect on how honestly people answer personal questions put to them by the site. But paradoxically, it turns out we're more likely to spill our secrets on websites that appear less reputable. The way a website phrases questions also affects our willingness to disclose revealing information, the researchers found.

NudgeCam encourages good footage by tracking faces and assessing sound quality.

If you've ever accidentally shot a video sideways, or cropped the top of someone's head out of a frame, you might be glad to know about a new cell-phone app that automatically provides shooting advice to videographers.