I wonder why lemons taste sour：and other questions about senses I wonder why lemons taste sour and other questions about the senses I wonder why leaves change colour and other questions about plants I wonder why leaves change color and other questions about plants I wonder why ponies wear shoes：and other questions about horses I wonder why horses wear shoes and other questions about horses I wonder why stars twinkle：and other questions about space I wonder why camels have humps and other questions about animals I wonder why snakes shed their skin：and other questions about reptiles I wonder why stars twinkle and other questions about space