How did whales that feed on tiny prey evolve into the largest creatures on Earth? And why don't they get even bigger?
The Great Pacific Garbage Patch, a floating accumulation of rubbish the size of a continent, has whales and dolphins in its heart.
Complex behaviour such as regional accents and cultural food preferences in whales and dolphins seems to be linked to brain size.
Space weather can impact life on Earth.
Highly prized and extremely rare, it's hard to tell if you've stumbled on this piece of sperm whale 'product'.