Quite how it was done is a bit of a mystery, even to Dr Kravchenko.

ECONOMIST: Superconductors

In response to this idea, Dr Kravchenko and his colleagues have proposed that a liquid-like phase of the electrons may explain their observations.

ECONOMIST: Superconductors

Speaking on Russian state television, the consul-general in Milan, Alexei Parmonov, named the dead as Denis Kravchenko, Irina Kravchenko, Vyacheslav Sleptsov, Yulia Yudina, Lyudmila Yudina and Rafilya Pshenichnaya, AP reports.

BBC: Italy: Russian tourists die in snowmobile accident