Sheaths also swell as a result of being dirty.. Horses with large beans (accumulations of secretions at the end of the penis) and large accumulations of sheath smegma (normal pasty secretion) often swell. Horses that urinate into their sheaths tend to have dirtier sheaths and more problems with swelling.
Some people think Alaska has less sunlight than other places. The opposite is true. Averaged over an entire year, Alaska gets 10-17 minutes more daylight per day than the rest of the country. If you include civil twilight, Alaska gets 40 minutes more light on average than the rest of the country.
You can experience the brightness of the Midnight Sun in Iceland between mid May until mid August; Iceland's hours of daylight on the longest days of the year is 24 hours per day (May-July) Iceland's hours of daylight on the shortest days of the year is 4-5 hours per day (December-January) Iceland's hours of daylight increase by 1-3 minutes every day between December 21 and June 21; Iceland's hours of daylight decrease by 1-3 minutes every day between June 21 and December 21; The Midnight Sun can be seen everywhere in Iceland