Why?

Joel Levy

'Informative educational and intellectually satisfying.'- The Guardian Ever wondered why humans need oxygen why the earth is round or why the universe is expanding? This book sets out to provide simple answers to the most fundamental questions about the world. Why is the sky blue? Why is water wet? Why do we need sleep? Why are there 24 hours in a day? Why is light faster than sound? Why?: Scientific Answers to Fundamental Questions gets to grips with concepts that might appear basic yet we struggle to find answers for. For each question the author provides a simple single line answer followed by more in-depth information that casts light onto the murkiest of scientific questions. This book covers the whole lot: physics biology chemistry geology geography meteorology palaeontology and planetary science with over 50 fundamental questions answered allowing you to wow friends and family alike with smart answers to the obvious questions they never thought to ask.