From Michael Hawkins
Although I enjoyed Stuart Clark’s look at dark matter (7 January, p 30), I couldn’t help being struck by the somewhat blinkered conclusions.
All is not lost if elementary particles do not make up dark matter. Only a few months before, New Scientist carried a carefully worded feature by Marcus Chown about my own research that makes the case for primordial black holes as dark matter (20 August 2011, p 38).
Edinburgh, UK
