Merida bravely reminds the feuding clans how much they've achieved working together, and then decides to break with tradition and choose who she will marry, rather than use marriage to make an alliance.
Princesses Anna and Elsa are segregated in their castle after Elsa, who has the power to turn things to ice and grows more dangerous as she matures, accidentally injures her sister. Anna sings Do You Want To Build A Snowman
Some animal species are under threat, while others are highly endangered. So, how many different endangered levels are there and what's the difference Find out by considering different Australian animals.
Astronaut Mark Watney must find a way to survive being stranded on Mars with 300 days' food to last at least four years. He uses his expertise in botany and chemistry to grow potatoes. (Coarse language).
Alan Davies and Marcus du Sautoy visit the UK's National Physical Laboratory, where Mark Oxborrow takes them through an experiment that demonstrates how prime numbers exist in nature, and the Riemann hypothesis.