The Open Source eXchange III was a mini-conference where members of the ALT.NET community talked about their favourite alternative .NET tools that increase programmer productivity. Units of Measure is a cool language feature in F#, developed by Andrew Kennedy, that lets you easily annotate values with units like metres, kilograms or seconds. Then F# type inference kicks in to give you automatic checking of your unit types at design and compile time, but cost you nothing at run time, e.g.
let gravityOnEarth = 9.8f<m/s^2> // Acceleration
Following a bit of a Apollo 40th Anniversary theme, I presented 3 code samples (attached):