Levitating magnet

The Levitated Dipole Experiment (LDX) reactor

Nuclear fusion - the melding of atomic nuclei that happens inside stars - is a long-sought goal on Earth. If scientists can achieve it, it could offer a powerful source of energy with few negative environmental consequences.
Scientists took a step closer to this goal in January 2010 when they announced they'd built a levitating magnet that created some of the conditions thought to be necessary for fusion. By suspending a giant donut-shaped magnet in midair, researchers were able to control the motion of an extremely hot gas of charged particles contained within the magnet's outer chamber. The density of this gas was close to what's needed for nuclear fusion, the researchers said.
Source: LiveScience