completed review of ch2
completed review of ch3
completed review of ch4 + finally changed DSN->WSN
completed review of ch5
completed review of ch6
completed review of ch7
added ch8: conclusion
touch-ups
update timekeeping
completed review app-A
completed review app-B
completed review app-C
completed review app-D
completed review of app-E
completed review of app-G
completed review of app-H
completed review of app-I
completed review of app-J
completed review of app-K