Okay kiddo, let me explain what 'human capital flight' means. It's when people with important skills or talents leave their country to go somewhere else.
Now, let's talk about Iran. Iran is a country in the Middle East with a rich culture and history. But some people who have the skills and knowledge to help their country grow and develop – like doctors, engineers, artists, and scientists – are leaving Iran to go to other countries.
Why are they leaving? There are a few reasons. One reason is that in other countries, they might have more opportunities to use their skills and talents and make more money. Another reason is that some people don't feel safe or don't like the way their government treats them, so they leave to find a better life somewhere else.
But when people with important skills leave a country, it can be bad for the country they're leaving. Iran needs these talented people to help build and strengthen its economy and society. So, sometimes this 'human capital flight' can be a big problem for countries, including Iran.