Don't assume that what we currently think is out there is the full story. Go after the dark matter, in whatever field you choose to explore.

We may have charted all the continents on the planet, and we may have discovered all the mammals, but that doesn't mean that there's nothing left to explore on Earth.

As a species, I think we have no choice but to try and forecast pandemics.

Many people on our planet right now despair; they think we've reached a point where we've discovered most of the things. I'm going tell you right now: Please don't despair.

I think we all choose our style from the ether and whatever is out there.

We see new things all the time. We see new retroviruses out there - which is the category that HIV falls into - and we're very, very concerned because this is the part of the world where HIV jumped from chimpanzees to humans.