Philip Aston’s paper “Is radioactive decay really exponential?” that was published in Europhysics Letters has been selected as one of the highlights of 2012. The highlights are a selection of 32 papers from over 800 published during 2012, and this paper is one of four selected in the category of Elementary Particles, Fields & Nuclear Physics.  In the paper,  he questioned the almost universally accepted belief that radioactive decay is always exponential. He considered various arguments that suggest that slowly decaying isotopes may decay non-exponentially.   Experimental verification of the theory is difficult due to the long timescales involved.