1. The Grandfather Paradox: If you travel back in time and accidentally kill your grandfather, you will no longer exist. But if you no longer exist, then you cannot kill your grandfather. If you don't kill your grandfather, then you exist. If you exist and you travel back in time...

    Some physicists cite the Grandfather Paradox as a reason time travel to the past is not possible. What do you think?

    # vimeo.com/124048227 Uploaded
  2. # vimeo.com/24794989 Uploaded
  3. A very brief explanation of the shadows cast by the moon to create both a total and partial solar eclipse.

    # vimeo.com/123447952 Uploaded
  4. # vimeo.com/123447953 Uploaded
  5. # vimeo.com/123447954 Uploaded

Nelsonia Educational

Becky Nelson Plus

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