It too sounds a fine idea, but even top private schools, with lots of money and good teachers, find it tricky to timetable lots of variation within one age-group's lessons.

ECONOMIST: Exams

But, by coincidence, he then discovered a group of scientists working on a mouse called Peromyscus that possesses the same less active variation of the MC1R gene as mammoths did.

ECONOMIST: The genetics of mammoth coat colour

There is tremendous variation in the prevalence and availability of fake drugs within and across countries, according to Kubic, whose group tracks counterfeiting incidents.

CNN: Fighting the growing menace of fake drugs