She was married to a rich entrepreneur for 18 years, and her life appeared enviable, yet for two decades she had a string of affairs, taking crazy risks to spend time with her lovers.
A MAC address is a unique character string, and since it identifies a specific physical device — one individual NIC — the MAC address, by convention, never changes for the life of the NIC.
But in recent years, it has emerged as one of the hottest new fields in biology, similar to string theory in physics or the search for extraterrestrial life in astronomy.