Are doppelgangers just coincidences?

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Offline thedoc

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Are doppelgangers just coincidences?
« on: 21/09/2016 22:23:01 »
Luke Pullar  asked the Naked Scientists:
   Hi there
I have a stack of questions, and don't expect them all to be answered (I'm not greedy) but thought there might be one or two which would be interesting enough for you to answer.
Here we go:
1. In regards to the "doppelganger" effect (where a person seems to have an exact duplicate of themselves), what is the likelihood of there being a strong genetic connection? Or are these simply cases of coincidence?
2. How tall can a mountain get? On first thought, it seems obvious that the larger a planet, the higher a mountain can rise, but then the gravitational pull of the planet would restrict the height (among doing other things). Is there a point where a mountain can only get so high relative to it's planet's size?
3. How did matter travel at faster than light immediately after the big bang?
4. If we pointed a telescope at the same point in space for a few/many years, would we see "new" (to us) stars as the light eventually reaches us from increasingly distant places?
5. If I move backwards at the speed of light (bear with me here) and turned on a torch, what would happen to the start of the beam of light? Would it be a glow frozen in one place? Would stationary bystanders be able to see a terminating light source, dangling in the air/space/whatever?
6. What are the odds of detecting gravitational waves? It's almost too coincidental that we only recently developed sensors accurate enough to measure this, and then we got "hit" by some from an object close enough to be felt. Surely the chances of this would be so minuscule as to be virtually impossible/improbable?
7. What is in between the internal parts of the body? I'm assuming it can't be air or blood which would get stale and prone to infection due to lack of circulation. It's not going to be a vacuum, and I doubt that the organs are all jammed in with absolutely zero spare space. So what is in there?
8.What would the effects be of living on a purely liquid diet? Would you be perpetually hungry? Does the body need solid food? And would you stop defecating if you never had solids?
9. In relation to the proposed probes to be sent to Proxima Centauri b, how does a laser provide thrust? And why are the velocity estimations limited to 0.25c?
Anyway, I hope there is something in here to pique your interest. There will be more questions in the future, I'm sure!
Insert platitudes here, for the awesome stuff you do. Insert more if it means you'll answer my questions!
Thanks!Luke Pullar

What do you think?
« Last Edit: 21/09/2016 22:23:01 by _system »