On this episode...   * How many molehills would you need to make a mountain out of them?    * How do you find friends?   * Matt revisits some mistaken maths.    Don't forget to send in your Blue Dot Festival problems to us on the website below - we might just do it live! And, as always, if you've got a problem or a solution, hit us up on aproblemsquared.com.   And if you want want even more from A Problem Squared (who doesn't) find us on Twitter and Instagram.