Jack Andraka

Too often, teens are lazily thought of as apathetic and self-centred.

But a new generation of young activists has proved that many teenagers are, in fact, deeply concerned with social, political and environmental issues - and they’re fully prepared to do something about them.

Chief among them is 16-year-old environmental activist Greta Thunberg, who has urged British politicians to "listen to the scientists" regarding climate change, while speaking on BBC Radio 4's Today programme.

Here are five inspirational people who've had a massive impact on the world in their teen years.