A new article was just published in Nature, revealing it to be more complex than previously believed. Regarding the date, according to the NY Times, it's 2nd century BC, not CE.
agrivate a professor remind them that "CE" stand for "Christian Era."
Yeah, I noticed the dating there. Up until today all the references I found placed it in the 1st or 2nd century CE. Now, a lot of them are changing their dates: Wikipedia now puts it at 80 BCE. That indeed may be the reason for the article. Researchers may have just redated it.