A spinning gyroscope on a string.August 17, 2021/by John R. Ammon https://thepricklypear.org/wp-content/uploads/logo_2023.png 0 0 John R. Ammon https://thepricklypear.org/wp-content/uploads/logo_2023.png John R. Ammon2021-08-17 07:16:122021-08-17 07:16:12A spinning gyroscope on a string.