Eli Jerby and his colleagues at Tel Aviv University in Israel have developed a special drill that uses microwaves to make holes from 1mm to 1cm wide in concrete and glass simply by heating the materials past their melting point, (nearly 2,000 ºC) and pushing the drill bit through.

The drill bit is a needle-like antenna that emits intense microwave radiation. The microwaves create a hot spot around the bit, melting or softening the material so that the bit can be pushed in.

Source: OhGizmo