Nicholas Luciano, a Spallation Neutron Source central room shift supervisor at Oak Ridge National Laboratory, monitors data in this file photo.

The Oak Ridge National Laboratory is again home to the computer system capable of handling the most data of any in the world. The fastest supercomputers are:

1. Titan Cray XK47 at Oak Ridge National Laboratory, 17.59 petaflops per second

2. Sequoia BlueGene/Q at Lawrence Livermore National Laboratory, 16.33 petaflops per second

3. Fujitsu's K computer at the RIKEN Advanced Institute for Computational Science in Kobe, Japan, 10.51 petaflops per second

4. The Mira BlueGene/Q computer at Argonne National Laboratory in Lemont, Ill., 8.16 petaflops per second.

5. The JUQUEEN BlueGene/Q computer at the Forschungszentrum Juelich in Germany, 4.14 petaflops per second.

Source: Top 500 Superfund List, Waibstadt-Daisbach, Germany. A petaflop is a measure of a computer's processing speed and can be expressed as a thousand trillion floating point operations per second.