Decade of the 20th century when racquetball originated

Racquetball is a relatively young sport, with its invention credited to Joseph G. Sobek. It originated in the United States of America in the 1950s basically from the game of tennis (and other popular sports like handball and squash). Therefore, the decade of the 20th century when racquetball originated is the FIFTIES

answer: when you start thinking negitivly and start having suicidal thoughts

or harming yourself, sadness is part of depression as well as fear and anger combined