Nintendo tumbler puzzle Nintendo tumbler puzzle The Nintendo tumbler puzzle, also known as the "Ten Billion Barrel" in English and originally in Japanese, is a mathematical puzzle in the style of Rubik's Cube. It was invented by Gunpei Yokoi of Nintendo in 1980 and was covered by (until the patent expired in March 1995 due to non-payment of a maintenance fee). It consists of a "cylinder" of transparent plastic divided into six levels, together with a black plastic "frame". The frame consists of upper and lower discs that are joined together through the middle of the cylinder. The top and bottom levels of
Professor D Professor D Damon Sajnani, better known by his stage name Professor D or ProfessorD.us is a Canadian rapper and assistant professor based in the United States. He is the lead vocalist of The Dope Poet Society and professor of African Cultural Studies at the University of Wisconsin - Madison where he teaches courses on Hip Hop and Politics in Africa and around the world. He was the inaugural Nasir Jones Hip Hop Fellow at the W.E.B. Du Bois Institute at Harvard University in 2014-15. He is known for rapping about social issues and global politics with sophisticated rhyme structures and