Venomous critters may inspire the next generation of painkillers.

In the 1890s, William Coley figured out a way to destroy cancerous tumors by injecting patients with toxic bacteria. Debunked at the time, his treatments laid the groundwork for modern immunotherapy.

For the first time in thousands of years, the massive creatures of the Pacific are finding their way across the Arctic to the North Atlantic. But trouble may await them.