Greg and Bella are back with a brand-new term of teachers teaching their favourite lesson! To kick us off we have RE teacher Mr Bonfield with a lesson about sadness – why do we need it?

To mark World Mental Health Day, Mr Bonfield looks to three great philosophers - Aristotle, Nietzsche and Schopenhauer - to see what they thought the point of sadness was. Wouldn't the world be a happier place without sadness? Or could understanding sadness be the secret to unlocking happiness?

As the lesson unfolds, Greg and Bella find out what Pixar films, superheroes, and pop songs can teach us about sadness - and find out why a whale called Blue 52 might be the saddest animal on the planet. They’ll explore why the colour blue is linked with sadness, discuss the things that make them cry and talk about the historical heroes who lead their best lives despite the challenges they faced. Greg also reflects on how the poem Guesthouse by the ancient poet Rumi changed how he thinks about sadness, and Bella talks about her own experiences with anxiety.

Mr Bonfield ends the lesson by finding out what Greg and Bella’s strategies are for beating the blues – from exercise to laughing with friends, being creative to having a hug.

Bad students of all ages are welcome. Expect brilliant teachers, captivating subjects but absolutely no homework.

Get in touch with the podcast - email us at teachme@bbc.co.uk