When something that conducts electricity sweeps through a magnetic field, a current starts to flow through it (this is the basis of a dynamo).

ECONOMIST: Here be serpents

Rangers legend Colin Stein scored the first goal in the Ibrox side's 3-2 win over Dynamo Moscow in Barcelona 36 years ago and he has drawn parallels with the current Rangers team who take on Zenit St Petersburg in Manchester.

BBC: Echoes of 1972