Waves break against the rugged intertidal zone on the coast of northern Portugal ... grow attached securely to the rocks amidst the strong, crashing surf. The challenge of harvesting them results ...

Spanning nearly a quarter of a million kilometres, Canada’s coastlines are home to one of the toughest habitats for any creature to live in: the intertidal zone ... force waves every 10 seconds.

“And you can be my assistant,” I kindly informed her. We were exploring the intertidal zone — that extraordinary world between high and low tide — on a very special beach: the beach I grew ...