circa 40,000 BCE — the earliest boats are invented

Okay, this one’s a bit of a reach, but work with me here.

At some point, boats were invented. We do not when, or where, or by whom. Nor, Mr Brown’s opinions aside, do we know what gender the inventor had.

What we do know is that, at the very latest, humans arrived in Australia having traveled by boat approximately 40,000 years ago. So that’s when I’ve placed the date of the earliest boats, even though it was, in all probability, quite some time earlier.