Before revision: If the provider's network fails, all Internet connectivity is lost Ring networks in which the failure of a single node or connection between nodes brings down the entire network Systems, including social ones, that rely on a single person, who, if absent or becomes permanently unavailable, halts the entire system Brittle materials, such as "over-reinforced concrete", when overloaded, fail suddenly and catastrophically with no warning.
After revision: If the provider's network fails, all Internet connectivity is lost Systems, including social ones, that rely on a single person, who, if absent or becomes permanently unavailable, halts the entire system Brittle materials, such as "over-reinforced concrete", when overloaded, fail suddenly and catastrophically with no warning.