Do dolphins ever sleep? : 211 questions and answers about ships, the sky and the sea

Why is the sea salty? How does the wind create waves? If ice is transparent, why are icebergs white? Why are cold seas green and warm seas blue? Why don't rope strands untwist? Why does a dinghy slide backwards as you try to climb out?

Why do the sun and moon sometimes have halos? Why do barnacles attach themselves to boat hulls? Do "Dolphins Ever Sleep?" provides the most astonishing answers to a whole range of fascinating questions you may have wondered about or may never even have thought of asking! 'This is one of those books that you open by chance and do not stop reading' - "Voiles et Voiliers".