World Blood Donor Day 1868. World Blood Donor Day celebration brings a precious opportunity to all donors for celebrating it on national and global level as well as to commemorate the birthday anniversary of the Karl Landsteiner (a great scientist who won the Nobel Prize for his great discovery of the ABO blood group system). The theme for Blood Donation Day in 2018 is 'Be there for someone else. Give blood. Share life' The theme for Blood Donation Day in 2017 focus on blood donation in emergency situations. The first response when an emergency happens is "What Can You Do?" and the answer is
Nobel Prize controversies Chao was the first to experimentally identify positrons through electron–positron annihilation, but did not realize what they were. Anderson, Chao's classmate at Caltech, used the same radioactive source, , as Chao. (Historically, was known as "thorium C double prime" or "ThC", see decay chains.) Fifty years later, Anderson admitted that Chao had inspired his discovery: Chao's research formed the foundation from which much of Anderson's own work developed. Chao died in 1998, without sharing in a Nobel Prize acknowledgment. The 1923 prize went to Robert Millikan "for his work on the elementary charge of electricity and on the photoelectric effect".