by Dimitar Deinov/AP Photo
Dimitar Deinov/AP Photo
In 1978 Georgi Markov, a Bulgarian dissident, was waiting for a bus near London's Waterloo Bridge when a man jabbed him with an umbrella and disappeared in a taxi. Within days, Markov was dead. Doctors discovered a tiny metal pellet lodged in the dead man's thigh. The pellet, injected through the tip of the umbrella, contained the poison ricin.