2003 ricin letters lethal dose of ricin in humans provided that exposure is from injection or inhalation. Ricin is easily purified from castor-oil manufacturing waste. It has been utilized by various states and organizations as a weapon, being most effective as an assassination weapon, notably in the case of the 1978 assassination of Bulgarian dissident Georgi Markov. On January 4, 2004 new federal transportation rules took effect which directly affected the over-the-road trucking industry in the United States. The rules took effect with a 60-day grace period and were aimed at reducing fatigue related accidents and fatalities. Called the most far-reaching rule changes
Waterloo Bridge, Betws-y-Coed imaginatively-designed iron road bridge by Thomas Telford, engineer, a significant example of early iron technology". Waterloo Bridge, Betws-y-Coed Waterloo Bridge () is an early cast iron bridge, spanning the River Conwy at Betws-y-Coed, in Conwy county borough, north-west Wales. The bridge is located about half a mile south-east of the village. It was built by the civil engineer Thomas Telford. An inscription on the arch records that it was constructed in the year of the Battle of Waterloo, but although designed and constructed in 1815, its erection was not completed until the following year. It was raised as part of