Why everyone wants to get back to the moon - a special episode with Kevin Fong. The United States has just returned to the Moon for the first time in 50 years. But they are not the only country in the world with their sights set on space exploration. Why are countries like India, China, Japan and Saudi Arabia trying to complete their own lunar landings? Katya Adler speaks with Kevin Fong and Jonathan Amos the BBC’s science correspondent.