Study brings us one step closer to solving 1994 thallium poisoning case

The 1994 poisoning of Chinese student Zhu Ling left her permanently disabled.

Zhu Ling was a sophomore majoring in physical chemistry at Tsinghua University in Beijing, China, when she mysteriously began losing hair, with accompanying stomach pain and muscle paralysis, sinking into a coma four months later.

Zhu survived, but with serious brain damage, loss of most of her eyesight, and ability to speak. She remains partially paralyzed, requiring 24-hour care. Worse, she had been deliberately poisoned.