Question: What's it like to grow human cells in flasks?

Zach Dixon answered on 11 Mar 2014:

It is really cool! You have to look after them though, they need new food every couple of days!

My cells are particularly cool because I altered their DNA (the instructions that tell them how to behave) to make them glow green! So when I look at them down a microscope they are all lit up 🙂