subjects of study. John Wesley Powell, (born March 24, 1834, Mount Morris, New York, U.S.âdied September 23, 1902, Haven, Maine), American explorer, geologist, and ethnologist, best known for his exploration of the upper portion of the Colorado River and the Grand Canyon. Early life and initial explorations. 1  Powell was the fourth child of English immigrants Joseph Powell, a tailor, farmer, and itinerant Methodist preacher, and Mary Dean, a missionary.
If on the other hand you use an incubator in order to hatch fertilized chicken eggs, they can sometimes hatch a day or two early, or they can also hatch out a few days late. Things like humidity and temperature play a significant role.
General Hatching rules for chicken eggs. 1  Don't set fewer than six eggs. 2  Chicken eggs take twenty-one days to hatch when incubated at optimal temperature. 3  Still-air incubator temperature should be 101.5, measured at the top of the egg, while forced-air (or turbofan) incubators should keep a temperature of 99.5. Still-air incubator temperature must be higher because the non-moving air inside the incubator rests in layers, cooler at the bottom of the incubator and warmer at the top.