The one thing? The ONE thing? But there is so much that should be changed!

One thing. Well then.

Like Mark Twain, I wish people would travel more.

"Travel is fatal to prejudice, bigotry, and narrow-mindedness, and many of our people need it sorely on these accounts.
Broad,wholesome,charitable views of men and things cannot be acquired by vegetating in one little
corner of the earth all one’s life."

I think that sums it up. Surely a lot of problems would be solved if people were more broad-minded in their thinking?

I would hope so.

Still, it's really hard to say just one thing. What is your one thing?