Greenland sharks entered popular science writing on the strength of one number, 400 years. Some individuals swimming in the North Atlantic today were alive during Isaac Newton's lifetime, born centuries before anyone thought to ask how old a shark could get.

Greenland sharks entered popular science writing on the strength of one number, 400 years. Some individuals swimming in the North Atlantic today were alive during Isaac Newton's…

Greenland shark lifespan explained: A rare Greenland shark found washed ashore in Ireland offers scientists a unique opportunity to investigate the mysteries of one of the oldest…