I'll give a shoutout to Skunk Works - even if you're not particularly into aviation or aeronautical engineering it's a highly engaging read.

There's this one section covering part of the development of the stealth fighter F117 Nighthawk where one of the engineers makes a discovery that the amount of radar energy returned to a sender is INDEPENDENT of the object's size if it is composed principally of flat surfaces.

This is why the F117 looks like such a polygonal mess from Starfox on the Nintendo 64.

I love Skunk works! the book right next to it is called the Goal and is my highest recommendation, so you two should check that one out as well.