From the <<https://www.scottishcountrydanceoftheday.com/daysoftheyear/reel-of-the-neutrino|Scottish Country Dance of the Day>> site for 13 July.

Dedicated to Kevin Lesko after the awarding of the 2015 Nobel Prize for Physics to the Sudbury Neutrino Observatory (SNO). 

Neutrinos are one of the fundamental subatomic particles. The are neutral (have no charge) and very small mass which mean they can travel great distances unimpeded and are extremely difficult to detect.