Supercomputers today have thousands of processors, can perform trillions of calculations per second and have hundreds and hundreds of gigabytes of memory capacity. TOP500.org maintains a list of the fastest 500 supercomputers in the world. Here are the countries with the most supercomputers on the list:
United States has 257 of the fastest supercomputers.
United Kingdom has 53.
Computers this powerful are used to simulate global weather phenomena, simulate protein folding, sequence genes, play chess, predict traffic patterns.