What technologies could we use to replace oil?

http://answers.yahoo.com/question/?qid=20060616165836AACihbL&pa=FYd1D2bwHTHwIbpjFOg4QFp3KB.11MJTlMdMKY07aIUhCw– Geothermal power, solar power, radio signals, microwave lasers, how could we end the use of fossil fuels in the next 20 years and still have a booming economy and civilization? How do we create a balanced ecosystem on earth?… Continue Reading

Please, need a real scientist's answer to this long & complex question (not for school)?

Thanks for looking at my question. This is very complicated and more than a little unusual, so please, if you’re just guessing or think you might know, don’t answer. Please only answer if you’re actually a qualified scientist with some… Continue Reading

Please explain your choice here, I don't know how to find the assumption from the argument?

For many decades, humans have dreamed of exploring beyond the solar system to the distant planets and stars. The space technology for doing this has until recently been confined to the realm of science fiction. However, developments in science are… Continue Reading

Would it be possible to travel to another solar system?

I’m not talking science fiction. I realize that our current propulsion capabilities make it impossible to travel there in one lifetime. but does anyone think that we have the capability to create a self sustaining colony vessle that will serve… Continue Reading