a type of nuclear explosive being developed by the US Department of Defense could blur the critical distinction between conventional and nuclear weapons. The work has also raised fears that weapons based on this technology could trigger the next arms race.
Cambridge University Library holds the largest and most important collection of the scientific works of Isaac Newton (1642-1727). More than 4,000 pages have been scanned, including his annotated copy of Principia Mathematica, containing Newton's laws of motion and gravity.