So, where are the robots? We've been told for 40 years already that they're coming soon. Very soon they'll be doing everything for us. They'll be cooking, cleaning, buying things, shopping, building. But they aren't here. Meanwhile, we have illegal immigrants doing all the work, but we don't have any robots.

If you gave kids peas that didn't look like peas and said they were a space shuttle, they're much more apt to eat them because it's now playtime.

The only way to make something cheaply today is to have it mass-produced. For example, you wear the same shoes as everyone else. If you had a fabber, you could custom-make shoes that perfectly fit your feet. Three-dimensional printing will help us move away from the mass consumption that is so deeply ingrained in our culture.

When it costs you the same amount of manufacturing effort to make advanced robotic parts as it does to manufacture a paperweight, that really changes things in a profound way.

I don't think Brian Cox does 'The Wonders of the Solar System' because he believes the world would be a better place if people understood about the rings of Saturn; I just think he finds physics extremely interesting. It brings him joy, and he wants to spread the love. I feel the same about economics.

Philosophy of science without history of science is empty; history of science without philosophy of science is blind.

New discoveries in science will continue to create a thousand new frontiers for those who still would adventure.

When I was at school studying biology, I wanted to be a medical researcher. I did work experience at St Mary's Hospital in London, and I begged them to let me see the post mortems. So the first time I saw a naked male was at 15, when I saw an 89 year old man who had died of a brain hemorrhage.