Every week Ron and Laura meet up to cover a little bit more of the GCSE Science syllabus and try and re-teach laura GCSE science.

This week they return to biology, and attempt again to get Laura to understand that cells and atoms are different things. Maybe one day it will sink in? It's not today though.

Via a quick description of how electron microscopes work, the siblings get on a mission to understand what makes cells different to one another. They look at the different organelles that can give cells the abilities they need. Starting with jizz obviously.

Ron tries to explain to Laura what DNA is and what it's up to. She manages to not talk about chicken.

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