Bill Stone is a cave explorer. He descends thousands of meters in to the earth while being in the field for anywhere from 2-4 months with groups of 20-150 people. He starts out by speaking of how hard it is to keep your mind while having interpersonal conflicts from stress from being so deep and along in the earth in complete darkness.
After talking about how hard it is to keep your mind while being underground for so long, he talks about something he helped to invent which can map accurately and in 3-D the caves that are found filled with water. He hopes that in the future, this invention can be used in space on one of Jupiters moons 'Europa' to go under the ice and possibly find the first signs of life outside of Earth.
Bill Stone believes that humans should go farther into space and have normal visits to space and more ability for general exploration to visit space. He thinks the best way to do this is to mine the moon for fuel. He says the closest this can be done is in 7 years.
I like this Ted talk because first of all, Bill Stone uses great visual aids and he is very literate. Second of all, he is passionate about what he is speaking of and it really rubs off on the people who are listening. Third of all, instead of talking about just exploring the outdoors on the earth, he goes beyond our atmosphere and he wants to explore even more then simply our earth. He is very inspiring and I can tell that he is passionate about what he's doing.