Here is Richard Feynman's answer to a similar question (this isn't about gravity but about this type of question): http://www.youtube.com/watch?v=wMFPe-DwULM ht

Here is Richard Feynman's answer to a similar question (this isn't about gravity but about this type of question): http://www.youtube.com/watch?v=wMFPe-DwULM http://www.youtube.com/watch?v=wMFPe-DwULM