VIDEO & PIC: Forcing a light bulb to burn without any wires/leads/conductors

It is not a fake or a joke.

Some guys from St. Petersburg University do amazing things:
They force a light bulb to burn without any wires/leads/conductors.
The most amazing thing here is that they use just “naked” light bulb without anything else.

See below:

Video:


Pic:









May be somebody knows how they do it, if so tell me please.