Don't know if this is rightly philosophical, but it's pretty cool to contemplate.

Suppose time travel was possible and you traveled back to before you were born. Where did you come from? Also suppose you unintentionally change events so that your parents never meet. How are you still there? Or would you be?

Is the past immutable, or can a change made by a time traveler instantly change the present reality? Or would a change simply create a branching reality in a separate time line?

Suppose an older wiser you went back into time and met your younger self. What advice would you give yourself? Would you suddenly remember the event happening, or would you "kill" yourself by creating a branching time stream?

:S5: