When entrepreneurs used his invention to play music, Edison thought it was a debasement of his idea. Our widespread misunderstanding of inventors as setting out to solve society's problems causes us to say that necessity is the mother of invention. Actually, invention is the mother of necessity, by creating needs that we never felt before. (Be honest: did you really feel a need for your Walkman CD player long before it existed?) Far from welcoming solutions to our supposed needs, society's entrenched interests commonly resist inventions.
Medium-size dogs are at the midway point between tiny and massive canines, and both height and weight factor into the classification. Medium-size dogs generally weigh in the ballpark of 35 to 65 pounds, according to Kim Williamson of Animal Planet.. In terms of height, medium-size dogs are usually from 1 to 2 feet tall, measured from the ground to the withers or shoulder.
Growing to a height of 30 inches, these dogs can weigh as much as 250 pounds. As a Great Dane holds the record for tallest dog, an English mastiff holds the record for heaviest. The biggest weight for a dog ever recorded was an English mastiff named Aicama Zorba, who weighed in at 343 pounds. Their size is a significant part of the breed's past purpose, which included blood sports such as baiting bears, bulls and lions.