Authors: Hawkins, Ronnie Campbell, Duncan Mas, Lena et al.
Source: New Scientist; 3/17/2012, Vol. 213 Issue 2856, p30-31, 2p
Authors: Summers, Bill Clarke, Jeff Mckelvie, Neil et al.
Source: New Scientist; 10/22/2011, Vol. 212 Issue 2835, p34-35, 2p