How do you get a ship in a bottle?

What is a light year?

What is pollution?

Did pirates bury their treasure?

Who was Robert Falcon Scott?

Why is the sky blue? 

What was Elizabeth I's 'mask of youth'?

Do ships get recycled?

Human or robotic space exploration?

What was the race to the South Pole? 

Who was Nelson?

What was scurvy?

What is a solar eclipse?