Are Majorana fermions there for real?

Signatures of Majorana fermions in hybrid superconductor-semiconductor nanowire devices:

http://arxiv.org/abs/1204.2792

http://www.sciencemag.org/content/early/2012/04/11/science.1222360.abstract


For a popular account, see http://www.bbc.co.uk/news/science-environment-17695944