What is the most fascinating thing you learned when you read ntpd's configure script? What is the most interesting thing you learned reading glibc? Were you at

What is the most fascinating thing you learned when you read ntpd's configure script? What is the most interesting thing you learned reading glibc? Were you at all concerned when you discovered that the sources come from http-only servers and only have un-signed md5's for checksums? Did you find the support for HP-UX distracting?