Typos tend to materialize when you hit 'submit', 'publish' or other similarly labeled buttons. Very annoying. At least we've left the days of lead type behind so fixing is a bit quicker.

Sometimes I wonder if those buttons have some kind of 'scramble grammar' logic built into them...

  lead the world, create jobs, and tremendous value

needs another "create". much more minor than the other typo though!

"I can't tell you how many times I and others read over that"

From years of being in the graphics business I noted that people tended to miss words that weren't particularly difficult but at the same time (and same people) usually caught difficult words.

My reasoning was that people "chunk" the easy frequent words but slow down and think about every letter in the difficult words.

Some of the most common errors were actually with the city names and street addresses (and numbers) for example.

I've read that when not perusing the text we are only looking at the first and last letters of a word and in some cases the general shape of the word to determine which word it is, leading to frequent typos by otherwise very intelligent thoughtful people. Cheers to YC.