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.

When my parents were divorced in the late '70s, early '80s, the climate was that you should screw over your ex as much as possible - get the worst lawyer in the world, all that. That's not what people are out to do anymore. It feels cruddy to try and destroy each other just because you're breaking up.

It is the greatest scam in history. I am amazed, appalled and highly offended by it. Global Warming; It is a scam. Some dastardly scientists with environmental and political motives manipulated long term scientific data to create an illusion of rapid global warming.

As a group, we want to follow good and green strategy. Setting targets is one element of that. The second part is to design products which meet environmental goals.

Climate change, demographics, water, food, energy, global health, women's empowerment - these issues are all intertwined. We cannot look at one strand in isolation. Instead, we must examine how these strands are woven together.