A Russian dissident is murdered with radioactive poison:

The doctors treated Litvinenko with a heavy dose of antibiotics. And yet his body continued to break down. Three days after admission, he was being fed through a tube. His hair was falling out, and Marina gathered it in little bundles from his pillow and pajamas. As the medics tested Litvinenko for AIDS and hepatitis, he kept telling them: I’ve been poisoned. On November 11th, ten days after he fell ill, he gave an interview to the BBC Russian Service saying he’d suffered “a serious poisoning”, and implying that it had been carried out by an Italian associate, Mario Scaramella, his lunch companion at the sushi bar that Wednesday.

The next morning, further medical reports arrived. The doctors had run an array of tests. One was for radiation exposure: it came back negative. Instead they found something more complex — and more surprising. Some kind of exotic chemistry, some strange poison, was in his blood. Immediate attempts to identify it left them baffled.