In the Middle Ages a moment (or momentum) was defined as one of 40 parts of an hour, which is equal to 90 seconds [1]. The typical human response time is around 100 milliseconds, and as a time interval it defines what we experience as the current moment.
Naturally, time intervals are related to the human condition – but we as mankind did not stop there. Science explores the physics of time, revealing a plethora of possible time intervals. To mention the two extremes, cosmology can determine the age of the universe to 4.4 x 1017 seconds [2], while quantum physics defines the Planck time to 5.4 x 10-44 seconds — an interval so short that the concept of time loses its validity [3].
