Once upon a time, the world was flat.
Now it’s round.
Who knows? Maybe some day we’ll find out it’s square.
It’s hard to come across a cold hard fact anymore.
Drink 8 glasses of water a day. Drink 16 glasses of water a day. Don’t drink any water; get all your water from fruits and vegetables.
The contradictory advice goes on forever. There’s almost nothing you can nail down with absolute certainty.
Even your own content.