it is also the lightest element isotopes are atoms of the same element with different numbers of neutrons in ancient times the elements referred to fire earth water and air helium is the second most common element in the universe but is very rare on the earth
Featherweight is a weight class in the combat sports of boxing, kickboxing, mixed martial arts and Greco-Roman wrestling.
A featherweight boxer weighs in at a limit of 126 pounds (57 kg). In the early days of the division, this limit fluctuated. The British have generally always recognized the limit at 126 pounds, but in America the weight limit was at first 114 pounds. An early champion, George Dixon, moved the limit to 120 and then 122 pounds.