Descartes Would Be Proud
Since you're reading this, I think it's safe to assume that you've already celebrated Think to Verify Your Existence Day.
Cogito ergo sum.
I think, therefore, I am.
That's the phrase most people recognize as coming from Descartes. He actually said it in French originally because more people understood French than Latin. I'm guessing today it's the other way around.
There are actually some philosophers who argue against this idea. They're rubbish. Don't bother following that rabbit hole.
If you want a good rabbit hole to fall into, try using the "Random article" link in the left column on Wikipedia. You'll see many silly articles which will only make you want to click the link again until you find an interesting one.
When you finally get to that good one, you're on your way down.
See you next week.