What is a yawn?

Readers answer other readers' questions on subjects ranging from trivial flights of fancy to profound scientific concepts
  
  

boys prepare to join a parade in the Vatican. Photograph: AP/Bullit Marquez
Know how you feel … boys prepare to join a parade in the Vatican. Photograph: AP/Bullit Marquez Photograph: Bullit Marquez/AP

What is a yawn?

Meg Sutton Benseman, Auckland, New Zealand

• Post your answers – and new questions – below or email them to nq@theguardian.com. Please include name, address and phone number

 

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