How heartbeats can give alerts that save our lives

Folha de S.Paulo

How heartbeats can give alerts that save our lives

It was the 29th day of an extensive 100-mile canoe trip across the Canadian Arctic when Alex Messenger, 17 years old, was savagely attacked by a polar bear, and he had left the camp on his own that day in 2005 to climb a peak fishing peak. Read more