Why do we scratch an itch even though it makes it worse?

Answer the question above in 100 words or less by 7 June and we’ll print the best answers we receive in the next issue of Focus magazine.

Star Trek has been making me think this week.

According to Martin Rees, Astronomer Royal and president of the Royal Society, “[Aliens] could be staring us in the face and we just don’t recognise them.”

Apple unveiled its latest eagerly anticipated gadget — the iPad — a week ago today. Yes, it looks like a large iPhone, but what does it actually do?

Well, for a start, it's unlikely that you'll be holding a massive mobile up to your head to make calls like Dom Jolly. That’s because the iPad has more in common with netbooks — those small, cheap laptops designed for browsing the internet.