(via PBS Eons) Long before the rise of the great whites and hammerheads we know today, sharks and their cartilaginous relatives ruled Earth’s oceans and rivers in astonishing variety. It was the ...

Thanks to Opera for sponsoring this video. Port Jackson sharks live off the coast of Australia and have a mouth full of the weirdest shark teeth: pointed in the front and rounded like molars in the ...

I thought I was alone beneath the shipwreck — just clear water, coral, and silence — until the shark appeared. What followed was equal parts awe and adrenaline, an encounter I’ll never forget.