REBOL [
    Title: "Celcius"
    Date: 3-Jul-2002
    Name: Celcius
    Version: 1.0.0
    File: %Celcius.r
    Author: "Andrew Martin"
    Purpose: "Converts Temperature in Fahrenheit to Celcius."
    Email: Al.Bri@xtra.co.nz
    Web: http://valley.150m.com
    Category: [math 1]
    Example: [
    Celcius 32 
    Celcius 212
]
]

Celcius: func [
    "Converts Temperature in Fahrenheit to Celcius."
    Temperature [number!]   "Temperature in degrees Fahrenheit."
    ][
    Temperature - 32 / 9 * 5
    ]