I'm curious why we don't use the delay = 1000 variable in lesson 4 after we did that in lesson 2? Wouldn't that make lesson 4.8 easier?
That's a good idea. Actually you may have noticed we did bring in the delay=1000 code at 4.12. There are several concepts in Project 4 "Heartbeat" that are repeats of those covered in Project 2 "Display Games". That's partly due to how these projects evolved during our development, and we've considered removing the "remedial" material from Project 4. BUT we'd also like to get feedback on whether having some repetition like this might be helpful. What do you think?