A lot more than I would have expected. Turns out that biology degrees are not as lucrative as computer science degrees (at least amongst my anecdata), so people with biology degrees often fall into the CS career track. But they know how to engineer life!
There are so many fun (for various definitions of fun) things you can do with a home lab. I know a guy who collects fungi, just to sequence them - because he can. You can also design your own experiments to produce materials, engineer plants, and play with organs.
It's like modern alchemy, and it's super cool.