Wisdom in fragments

This is certainly something that is not without risk. We are pursuing an audacious goal, and we very well might fail. When NASA set the Moon landing challenge, it created a whole series of capabilities and technologies that we previously could not have imagined.

150 years ago, Aluminium was the rarest metal we knew of on the surface of planet Earth. Through technology we learned how to extract it from the bauxite in the Earth's crust, and discovered it was the most abundant metal. We went from Napoleon serving Kings and Queens on the finest Aluminium plate-ware to much more money made on Aluminium within 20 years.

Our mission is to expand the economic sphere of influence of humanity off the surface of the planet and into the solar system. Currently we have a vibrant economy in space that goes out to the geostationary belt- where the communication satellites are- and it stops.

All of the research we've done exploring space has now allowed small teams- with modest funds- to do what it once took entire governments to do. The design and collaborative power of an individual engineer or technologist is more powerful than it's ever been. The tasks themselves are getting more accessible too.

It's multi-fold. Firstly resources that are useful on Earth that we may get from outer space and secondly- which is perhaps a newer idea- is resources that will be useful in space itself. Water is the essence of life. In space it takes on a whole new form. We can use water as a radiation shield. Water is a molecule made of hydrogen and oxygen- and that happens to be rocket fuel.

Tonight, anyone who truly understands what justice is and what it requires of a society is ashamed to call himself an American.

Creator of The Wire, acclaimed HBO crime drama series

I can't look an African-American parent in the eye for thinking about what they must tell their sons about what can happen to them on the streets of their country.

Creator of The Wire, acclaimed HBO crime drama series

Behold, the lewd, pornographic embrace of two great American pathologies… Race and guns, both of which have conspired not only to take the life of a teenager, but to make that killing entirely permissible.

Creator of The Wire, acclaimed HBO crime drama series

putting all our knowledge together, the number of civilizations which could have arisen by now is about one billion.

Astronomer who created the Drake Equation for extraterrestrial life

even allowing for a margin of error of 5000%, there must be in our galaxy about 100 million stars which have planets of the right chemistry, dimensions, and temperature to support organic evolution.

Founder of Jodrell Bank Observatory & Radio Astronomer

The discipline I worked in was called SETI- The Search for Extraterrestrial Intelligence. Of course, that latter word is a misnomer. We don't know how to define intelligence or detect it at a distance. What we have done is to use technology as a proxy for intelligence- and therefore we have been looking for evidence of someone else's technology.

Pioneering astronomer & SETI Institute director searching for extraterrestrial intelligence

We used to think life could only exist in a very constrained rage of parameters; between the boiling and freezing point of water, at neutral pH, without too much pressure, with access to sunlight. What we know now is that life is more robust, and more opportunistic than we could have ever thought.

Pioneering astronomer & SETI Institute director searching for extraterrestrial intelligence

The iron in the haemoglobin in your blood was cooked up in the heart of a massive star that blew up about 8 billion years ago. We understand now in pretty good detail, how intimately connected we are with the cosmos.

Pioneering astronomer & SETI Institute director searching for extraterrestrial intelligence

The question as to whether we are alone has been asked by humans almost since they first crawled out of the cave! For millennia we used to ask the priests, philosophers or shaman- whoever we thought was wise- how to answer that question. They always came back with a belief system. What makes SETI different today is that instead of the verb 'to believe' we're trying to use the verb 'to explore'. We want to see what's actually out there instead of just believing what someone tells us is out there.

Pioneering astronomer & SETI Institute director searching for extraterrestrial intelligence

Many of our health problems challenges cannot be solved within one specific border. In the old days, we had 'tropical medicine' which was a colonial approach. This led to international-health during the cold-wars which simply meant the health of those far away. Now we have the concept of 'global health' which reflects the globalisation of the world.

Co-discoverer of Ebola virus & Global Health Leader

Public health goes everywhere. Winslow defined it as 'the science and art of preventing disease, prolonging life, and promoting health through the organised efforts of society'. I think that's a good start, but we have to see the culture and ecosystem of public health in the context of the community. Not only is happiness important to public health, but so is GDP and the environment. It's an immensely broad subject.

UK's Chief Medical Officer & Leading Public Health Advocate