There is also  growing concern that the widespread availability of radiological materials may result in a dirty bomb attack. Recently a secret group of fewer than 10 people in undercover congressional operation was easily able to buy the raw ingredients for a dirty bomb in US. This has set off alarms among …

Today, silicon microchips underlie every aspect of digital computing. Now Moore’s Law is stuttering, and the world’s supercomputer builders are confronting an energy crisis. But those big gains using silicon seem to have ended, with the high-end Intel Core i7 chips, for instance, have been on computer store shelves for …