The two met to discuss their activism at Britain's University of Oxford.
A round up of the global events, from Donald Trump's election to Brexit, that kept us on the edge of our seats.
New Harmony High School teaches students about coastal restoration, minimising energy use and sustainable living.
A timeline of the souring relations between the United States and the Middle Eastern nation that led to Donald Trump authorised the assassination of Iran’s top military leader.
Qasem Soleimani was killed near Baghdad International Airport; the leader of Iran has promised retaliation
She also said David Attenborough's nature documentaries have been a source of inspiration and that fighting climate change helped her depression.
The Swedish teen, named Time's Person of the Year, has inspired millions of people around the world to stand up for the environment.
He is only the third president in American history to be charged with committing high crimes against the nation.
The zoo said they like to name animals within two months of their birth because it helps them in their training.
Why is he in trouble? Will he remain in office? Everything you need to know.
A guide to the year's hardest words, from language-learning app Babbel.