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Is this what language is primarily used for?

Depends on what you consider language to be. A useful start may be to think about what language is primarily used for.

Any thoughts?

For how long did The Universe exist before the Big Bang? A rough value will do.

Check the speed of light in water.

Can light or photons have a velocity?

You may be correct. However, an explanation would make it seem less like an edict.

It seems a useful way to think about the problem. But you seem to be hinting that there are other ways.

Say the girl had been a boy whose first name was Adolph.

And did A agree?

I was thinking of photons interacting with virtual particles.

Does this have any relevance to the finite speed of light in "empty" space?

Agreed. The relative velocity on its own can't make the age difference.

Robin Trower Tony Iommi Jimi Hendrix Frank Zappa Larry Coryell (early stuff) Wes Montgomery Favorite band: OzricTentacles (especially Erpland)

Thanks Janus. That's solved the problem. I wish I'd thought of that.

The relative velocity on its own can't make the age difference: the system is symmetrical. An asymmetry has to be introduced for the age difference to become actual.

Chr 7 is specified as beep in the ASCII system. It belongs in a group of other characters like Chr 2 (enable printer) or Chr 13 (new line). These are not displayable characters but cause something to happen.

The value of the relative velocity determines the age difference. There will be an age difference only if there is a difference in the type of motion (acceleration) of the twins. Therefore, essentially, the twin's relative velocity generates the possibility of an age difference and a one-sided acceleration makes this an actuality. Is this basically correct?

But IMNSHO the original post by insane_alien wasn't about spelling. It was an attempt at a put-down of Masanov.

Maybe Masonov uses the same dictionary as I do.

According to my Oxford Dictionary P-H-A-N-T-A-S-Y is an appropriate spelling when talking about extravagant happenings.

If both twins accelerate back to meet would there still be a difference in their ages?

There are many more ways for things to go wrong than right and most of us probably experience things going wrong on a daily basis but in a fairly ordinary way. Maybe bad news is good news in so far as it is likely to be fairly sensational and therefore can put the mundane stuff into a more realistic context.

I am confused by the use of the word appear in (will appear younger) and when the twins are compared (one is younger). How do we get from appear to is?

If there was no one-sided acceleration (the two didn't meet again) would the assymetrical aging still apply?