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-# Lifetimes
-
-Lifetimes tell the compiler how to check whether references live long
-enough to be valid in any given situation. For example lifetimes say
-"make sure parameter 'a' lives as long as parameter 'b' so that the return
-value is valid".
-
-They are only necessary on borrows, i.e. references,
-since copied parameters or moves are owned in their scope and cannot
-be referenced outside. Lifetimes mean that calling code of e.g. functions
-can be checked to make sure their arguments are valid. Lifetimes are
-restrictive of their callers.
-
-If you'd like to learn more about lifetime annotations, the
-[lifetimekata](https://tfpk.github.io/lifetimekata/) project
-has a similar style of exercises to Rustlings, but is all about
-learning to write lifetime annotations.
-
-## Further information
-
-- [Lifetimes (in Rust By Example)](https://doc.rust-lang.org/stable/rust-by-example/scope/lifetime.html)
-- [Validating References with Lifetimes](https://doc.rust-lang.org/book/ch10-03-lifetime-syntax.html)