Greg James and Bella Mackie didn’t pay much attention at school. So they’re asking Britain’s most inspiring teachers to show them what they missed in this series of fascinating and fun lessons. This week it's Computer Science with Mrs Cunningham-Smith (Mrs C-S to you). She talks Greg and Bella through how computers have developed to the point they're currently at, and how algorithms actually work. We also find out how a woman in the 1840s created TikTok - and we find out exactly how Greg James crushed the dreams of a 16-month-old child. Bad students of all ages are welcome. Expect brilliant teachers, captivating subjects but absolutely no homework. Get in touch with your funny school stories and teacher recommendations - email us at [email protected]