http://www.newyorker.com/reporting/2012/10/01/121001fa_fact_groopman?¤tPage=all&pink=GjJ6ve
and
http://www.guardian.co.uk/science/2013/feb/19/coronavirus-how-easily-spread
and
http://www.guardian.co.uk/science/2013/feb/19/coronavirus-how-easily-spread