They were found next to bones, and it was clear that these stones had been shaped into butchering tools to strip meat and break into the bones of animals killed on the savannah.
I was allowed to stop playing the violin and piano before high school, I had far from a 4.0 GPA and was still allowed to celebrate birthdays and Christmas.
The good news is that we've made a lot of the mistakes already and we've learned some lessons (see this technical rant, this post-mortem or this experiment).
Earlier this month, Taobao was hit when the company was found to have frauded on its Golden Supplier list with the tacit permission of senior executives.
Only when we ask ourselves these questions every day, and only when we make progress by self-reflection will we have our road of life extended longer and wider.
In this scenario, ill-written software itself intended to patch the Y2K glitch might go overboard and read an intentional 9999 end-of-file value as a date and convert it into an explicit 1999 date.