The Beatles changed music forever. They took rock n' roll from a medium that was about cars and girls and gave it context, interesting chord changes and true musicianship.

The Beatles' story is all of our stories. It is about how the youth culture emerged, the drug culture emerged, how politics rose to the fore as a universal debate. It's about rebellion, it's about the growth of the British entertainment system, the growth of the rock n' roll entertainment system.

Study what you love, and you'll never have to work a day in your life. It'll be one great adventure.

With the mission to Mars, the whole world wants to get involved. So we actually have 13 different space agencies from around the world working on the global exploration road map.

The perfect pop song is a 20th-century creation; it's not a sonnet, it's not an opera, it's something short - three and a half minutes by nature - and has this ability to travel and to defy class and economic structures.

If time travel were possible, you still wouldn't be able to change the past - it's already happened!