Streaming replicas—and by extension, base backups—can become dangerously broken when the source and target machines run slightly different versions of glibc.

g/regex/p -> /g/re/p -> grep

The principal–agent problem, in political science and economics, occurs when one person or entity (the "agent") is able to make decisions and/or take actions on behalf of, or that impact, another person or entity (the "principal")