One thing I learned so far in the hands-on part of the program is be extra careful with IC chips. I put the IC 7473 in and wired it up the way the book described. I was 100% sure it was wired right, but only 2 of the 3 LED's would light. I checked, and checked, and rechecked the wiring, and could not find an issue. I then took out the IC 7473 and 2 pins were bent, and not in contact with the breadboard. I thought I was screwed, but I got out some needle nose pliers and fixed the pins, re installed and all is good, everything worked. So I learned two things, be extra careful with the pins, which was mentioned in my text books, and I learned how to and that I can fix the pins. I was quite proud of myself. I know not much to you veteran Techs, but it was cool to me. I learned to troubleshoot, be careful with pins, and I can fix the pins. Just wanted to relay that.