You cannot study other planets without referring to Earth and without applying the techniques and the insights of Earth science. And you cannot really do a good job understanding the Earth without the insights from planetary exploration.

When you think about alien intelligences making art, you then have to think about what art is and how bound up it is in the nature of consciousness. Why do we make art? And what can we expect to have in common with other creatures in universe?

Among the radio astronomers of SETI - the Search for Extraterrestrial Intelligence - it's only sort-of a joke that the true hallmark of intelligent life is the creation of radio astronomy.

Why should we consider defining intelligence as something global and as something that hasn't actually yet appeared on Earth? It may be useful for envisioning the future of our own civilization and any others that may be out there among the stars. It might give us something to strive for.

Everything is fraught with danger. I love technology and I love science. It's just always all in the way you use it. So there's no - you can't really blame anything on the technology. It's just the way people use it, and it always has been.

You never forget the discovery years. First kisses. The first time you try certain foods.

When I was living on my own, for a footballer it's easy to do the things that you're not supposed to, or not what the sport science team says. For example, if there's a packet of crisps, you're going to eat them. The same with a packet of sweets. Go to bed at a certain time? You're not going to if you're on your own.

We who grew up with 'drop and cover' drills know all too well what wonders science can bring us, and we like to see the guy in the white lab coat suffer a little. Or a lot.