Rust supports [scientific e-notation](https://en.wikipedia.org/wiki/Scientific_notation#E_notation) for numeric literals. I wonder if they'd make a good addition to the [literals](https://github.com/rust-lang/rust-by-example/blob/master/src/primitives/literals.md) section. ```rust println!("{}, {}", 2e-4, 2e4); // 0.0002, 20000 ```