Astronauts have been stuck in low-Earth orbit, boldly going nowhere. American attempts to kick-start a new phase of lunar exploration have stalled amid the realisation that NASA's budget is too small for the job.

When I was a student, the laws of physics were regarded as completely off limits. The job of the scientist, we were told, is to discover the laws and apply them, not inquire into their provenance.

No planet is more earth-like than Earth itself, so if life really does pop up readily in earth-like conditions, then surely it should have arisen many times right here on our home planet? And how do we know it didn't? The truth is, nobody has looked.

Should we find a second form of life right here on our doorstep, we could be confident that life is a truly cosmic phenomenon. If so, there may well be sentient beings somewhere in the galaxy wondering, as do we, if they are not alone in the universe.

We are committed to investing in new technology so we can remain a leader in the online luxury business.

We were the first urban school system in the country to wire all of our schools for the Internet.

A lot of people think technology is a solution, but it's really just a canvas for your work. It can make good things amazing and bad things terrible. Facebook allows you to have access to mass audience really quickly if you do creative really well.

If you develop a technology that only works in a single city, where it's kind of optimized for a specific city, that's not really that exciting.