Some interesting theories on the radiation poisoning of that former Russian KGB agent:

Mr. Epstein figures there are two possible ways Litvinenko got poisoned. One is that he was murdered when “someone surreptitiously sprinkled particles of Polonium 210 in his food.” The second hypothesis is that it was an accident, in which “the particles leaked out of a faulty container of Polonium 210 that he (or his associates) were carrying.”

Mr. Epstein reckons that “a former KGB agent might have a interest in obtaining a smuggled sample of Polonium 210 for a host of reasons, including arranging a sale to an intermediary, establishing the bona fides of someone claiming to have access to a Russian nuclear facility, or investigating the international black market in nuke components.