Thailand’s answer to Q, the legendary inventor of gadgets for movie spy James Bond, is busy at work at his warehouse on the edge of the country’s capital. Workmen inside are trying out the latest inventions of retired Major Songphon Eiamboonyarith, who runs defence contracting firm Precipart Co. The range includes umbrellas that shoot rubber bullets, bullet-proof baseball caps and a hand-held device to fire a man-sized net 10m to stop a villain in his tracks — via Slashdot
Ancient Roman concrete marine structures built thousands of years ago are stronger now than when they were first built.
So how has Roman concrete outlasted the empire, while modern concrete mixtures erode within decades of being exposed to seawater?