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## Main Question or Discussion Point

Hi. I've only just started reading on M-theory. I'm otherwise a lay person so I'm going to have some basic questions. Here's my first.

Standard Model has 17 elementary particles right? But doesn't M-theory say there's 18? Or 36 if you include the symetrical ones. So am I missing one partical? Or are the theories talking about something different.

I can see that my book mentions the graviton, which isn't in the standard model, so maybe that's the difference?

Thanks!

Standard Model has 17 elementary particles right? But doesn't M-theory say there's 18? Or 36 if you include the symetrical ones. So am I missing one partical? Or are the theories talking about something different.

I can see that my book mentions the graviton, which isn't in the standard model, so maybe that's the difference?

Thanks!