How shadows on other worlds would behave differently than on EarthRion NakayaMarch 26, 2018September 21, 2020
Universal Calendar Puzzle: Figure out the day of the week for any date everRion NakayaJanuary 17, 2018October 15, 2023
Marbles & Magnets synchronized to Tchaikovsky’s Waltz of the FlowersRion NakayaJanuary 10, 2018March 31, 2019