#OnThisDay Charles Babbage proposed a difference engine (1822).

Happy Birthday Steffi Graf (1969) - only tennis player to achieve the #GoldenSlam by winning all four Grand Slam singles titles and the Olympic gold medal in the same calendar year.

Birth Anniversary of Karl Landsteiner (1868) - known as the father of #Transfusion medicine. His birthday is celebrated as World #BloodDonor Day.

https://knowledgezone.co.in/news

#QuizOfTheDay: A player who wins all four majors and the #Olympic gold medal during their professional career is said to have achieved a "Career #GoldenSlam".

Rafael Nadal is one of only two men to complete the Career Golden Slam in singles. Who is the other player to complete Career Golden Slam?

A. Andre Agassi
B. Novak Djokovic
C. Roger Federer
D. Rod Laver

https://knowledgezone.co.in/resources/quiz?qId=647ac915a0241e3299b3467b

ஒலிம்பிக் டென்னிஸ் : அரையிறுதியில் தோல்வியைத் தழுவினார் ஜோகோவிச் https://patrikai.com/djokovic-lost-in-semifinals-and-his-golden-slam-hopes-end/ via @patrikaidotcom@twitter.com

#Tennis #Olympics2020 #Djokovic #GoldenSlam @DjokerNole@twitter.com @NBCOlympics@twitter.com @Tokyo2020@twitter.com