> first-class democracy lapsing into armed conflict
I can come up with none
> Throughout much of the recorded history, the monetary systems of the western world employed so-called commodity money, generally settling on coins minted out of silver or gold.
This is false. Silver and gold coinage was largely restricted to international trade, transactions were mostly done by keeping tabs. Gold and Silver coins developed most likely as you can easily produce them to share the spoils of war with soldiers. The important property of Gold and Silver is that you can easily steal it. See Debt the first 5000 years (https://en.wikipedia.org/wiki/Debt:_The_First_5000_Years)
> Biking on public roads? Wear a helmet
Head injuries are way more common in cars than on bicycles. Wearing a helmet while driving a car has a bigger benefit.
I can come up with none
> Throughout much of the recorded history, the monetary systems of the western world employed so-called commodity money, generally settling on coins minted out of silver or gold.
This is false. Silver and gold coinage was largely restricted to international trade, transactions were mostly done by keeping tabs. Gold and Silver coins developed most likely as you can easily produce them to share the spoils of war with soldiers. The important property of Gold and Silver is that you can easily steal it. See Debt the first 5000 years (https://en.wikipedia.org/wiki/Debt:_The_First_5000_Years)
> Biking on public roads? Wear a helmet
Head injuries are way more common in cars than on bicycles. Wearing a helmet while driving a car has a bigger benefit.