On genetics.

Mummy. What causes cancer to happen in the body?

Well, it can be a couple of things. You know how there are genes that can flip a regular cell into a cancer cell, right?

Yes. Then they grow really fast and can hurt the organs and travel around to new organs.

Right – well, environmental factors like chemicals can flip those genes on, or it can be genetic; sometimes they’re more likely to turn on when lots of people in the family have had cancer. 

Oh. But both of those are “genetic” – cancer happens because some of those genes turn on.

Correct! That is a very precise and sophisticated way of thinking about it. 

Can we watch some cells dividing on the internet tonight?

Discuss.

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