How the wind chill started

It started as an accident leaving a water bottle outside.  But that accident turned into how we describe how cold it feels with a strong wind.  A pair of Antarctic explorers named Paul Siple and Charles Passel in 1945 left plastic bottles of water outside in the wind and observed the rate at which they froze. The equation they worked out used the wind speed and air temperature to describe the rate at which the bottles gave off heat.