50, 100 & 150 YEARS AGO.

SCIENTIFIC discoveries; SUBDUCTION zones; SOLID waste management; RADIOACTIVITY; MASTODONS

The article recalls significant scientific discoveries from February 1872 to 1972. University of Washington researchers proposed the use of subduction sinks to dispose manmade solid wastes in 1972. Scientists in 1922 believe that radioactivity is common to all atoms. A farmer in Orange County, New York discovered the possible bones of a mastodon in a swamp on his premises.