- The Big Valley Unit includes trails maintained by Methow Trails, for winter skiing/snowshoeing, and summer horseback riding, biking, and hiking. The main part of the unit is mostly flat with little elevation change. The unit was purchased primarily to protect endangered fisheries riparian habitat along the Methow River, but is also in the migratory path of deer moving north and south between winter ranges in the lower valley and summer ranges in the upper Methow Valley and Pasayten Wilderness.
- Why is c the symbol for the speed of light? (math.ucr.edu)
Although c is now the universal symbol for the speed of light, the most common symbol in the nineteenth century was an upper-case V which Maxwell had started using in 1865. That was the notation adopted by Einstein for his first few papers on relativity from 1905. The origins of the letter c being used for the speed of light can be traced back to a paper of 1856 by Weber and Kohlrausch…