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Explaining an idea is not equivalent to taking credit for it.

> Carroll's argument

This assigns credit to Carroll.

It merely says that Carrol argued. The idea within the argument was no means assigned to her but used to make/support it.

Sean Carroll is a man, and look up the possessive apostrophe while you're at it!

Roger Penrose proposed that as far as I know, when Carroll was probably a high schooler.

No. At least as early as Arthur Eddington when Penrose was a twinkle in his dad's eye.

Thanks didn't know he'd made that argument although I knew he made the connection between entropy increasing and arrow of time.

This idea of time's relation to entropy is pretty iffy. I recommend this book https://news.berkeley.edu/2016/09/20/new-book-links-flow-of-....

who's taking "credit"