The Big Questions

They are the building blocks of everything

• Physics

They have discovered the secrets of long life

• Ageing

After all, scientists do sometimes make mistakes

• Philosophy

It was the birth of our entire Universe

• Space

It may seem obvious, but the dark sky tells us a lot about the Universe

• Physics

The reason for the cosmic speed limit

• Physics

Supposedly they will be back 'within two years'

• Extinction

But they may not look much like our world

• Planet

Strange physics could explain how our brains work

• Psychology

After all, there is no extra space

• Physics

Physics suggests that the future has already happened

• Time

Scientists could soon bring creatures back from extinction

• Extinction