If two people join their opposite hands and one slides his index and thumb over two joined fingers he will feel the other finger like it was one of his. This is all Planet SciCast's top researchers have been able to find about why this weird phenomenon, it's from a wiki on the web. So if you know more than us, please, use you fingers and get in touch scicast@nesta.org.uk
Source: NESTA
Date: 12 October 2007
Subject: Biology Miscellaneous
Suitability: Anyone