I wonder why snakes shed their skin :: and other questions about reptiles / I wonder why snakes shed their skin and other questions about reptiles I wonder why snakes shed their skin：and other questions about reptiles I wonder why stars twinkle :: and other questions about space / I wonder why whales sing :: and other questions about sea life / I wonder why the sea is salty :: and other questions about the oceans / Originally published: as I wonder why snakes shed their skin and other questions about reptiles 1996 I wonder why soap makes bubbles :: and other questions about science / I wonder why spiders spin webs :: and other questions about creepy-crawlies / I wonder why stars twinkle and other questions about space /