Scientists with the National Ignition Facility (NIF) at Lawrence Livermore National Laboratory announced today that they have achieved a critical step in fusion research: For the first time, their hydrogen fuel has given off more energy than it took in. Though an important milestone, the result does not mean that your Delorean is soon going to sport a Mr. Fusion reactor. NIF would need to achieve temperatures and pressures much greater than they are currently capable of before they can harness fusion energy.