https://padlet.com/38731/vg4nhtyevrlw en-us 2017-01-10 17:30:44 UTC 2017-05-17 11:26:25 UTC hello@padlet.com 38731 https://padlet.com/38731/vg4nhtyevrlw/wish/146326747  Hanson gregory in 1847 when he was 16 he came up with the ringshaped. ]]> 2017-01-10 17:41:48 UTC https://padlet.com/38731/vg4nhtyevrlw/wish/146326747 38731 https://padlet.com/38731/vg4nhtyevrlw/wish/146330612 https://youtu.be/TeiNNZ8tfT8]]> 2017-01-10 17:54:13 UTC https://padlet.com/38731/vg4nhtyevrlw/wish/146330612