[Dudoight]

Years back, I remember something about geographic clusters. The industrial and manufacturing ‘north’, may be pertinent.

[decimon]

Years back, I remember something about geographic clusters. The industrial and manufacturing ‘north’, may be pertinent.

Could be.

The further north, the greater the day/night seasonal shift. There's less of a seasonal difference in the length of daylight as you go south. Seems to me that that could affect the circadian rhythm.

[decimon]

Years back, I remember something about geographic clusters. The industrial and manufacturing ‘north’, may be pertinent.

Could be.

The further north, the greater the day/night seasonal shift. There's less of a seasonal difference in the length of daylight as you go south. Seems to me that that could affect the circadian rhythm.