https://padlet.com/mcdaniel_s/53w5a0zzdx9y Made with an open mind en-us 2018-09-05 15:21:12 UTC 2018-09-05 15:24:37 UTC hello@padlet.com mcdaniel_s https://padlet.com/mcdaniel_s/53w5a0zzdx9y/wish/278029795 Explain groups and periods.]]> 2018-09-05 15:23:08 UTC https://padlet.com/mcdaniel_s/53w5a0zzdx9y/wish/278029795