The new Lexicon Webster's encyclopedic dictionary of the English language

I wonder why countries fly flags : and other questions about people and places

Steele, Philip

I wonder why planes have wings  : and other questions about transport

Maynard, Christopher

I wonder why stars twinkle  : and other questions about space

Stott, Carole

I wonder why the sun rises : and other questions about time and seasons

Walpole, Brenda

I wonder why the telephone rings : and other questions about communication

Mead, Richard

I wonder why trees have leaves  : and other questions about plants

Charman, Andrew

I wonder why triceratops had horns : and other questions about dinosaurs

Theodorou, Rod

I wonder why the wind blows : and other questions about our planet

Ganeri, Anita

I wonder why vultures are bald : and other questions about birds

O'Neill, Amanda