Dennis Hong has written an essay that is spreading like wildfire across the Internet.

It is called “The Hardest Job Everyone Thinks They Can Do.”

He used to be a molecular biologist. When he told his friends about his frustration with a failed experiment, no one told him how to do it right.

Then he became a teacher.

Now everyone knows his job–or thinks they do–better than he does.

Everyone offers advice.

When he switched from “doing” science to teaching science, he was annoyed that he had to earn a teaching credential. Then he found out what it means to teach.

Here are just a few of his lessons:

“Teaching isn’t just “making it fun” for the kids. Teaching isn’t just academic content.

Teaching is understanding how the human brain processes information and preparing lessons with this understanding in mind.”

And more:

“Teaching is being both a role model and a mentor to someone who may have neither at home, and may not be looking for either.

Teaching is not easy. Teaching is not intuitive. Teaching is notsomething that anyone can figure out on their own. Education researchers spend lifetimes developing effective new teaching methods. Teaching takes hard work and constant training. I understand now.”

That is why we should invite all the legislators and policymakers to teach for a week before they make policy. At least a week.