In the story about IBM's BlueGene/L supercomputer (19 November, p 27), we said the machine "now runs at 280,000 billion floating point operations (teraflops) per second". In fact a teraflops (not a teraflop) is a trillion floating point operations per second, so BlueGene/L runs at 280 teraflops - and not teraflops per second, since the "per second" is taken care of by the "s" in teraflops. Finally, we should have said that no competitor to BlueGene has yet broken the 100 teraflops barrier, not the 100,000 teraflops barrier.
From issue 2528 of New Scientist magazine, 03 December 2005, page 25
