SIG03 Coordinator @sig03 Active 10 months, 1 week ago ActivityProfileGroups 1 PersonalMentionsFavoritesGroups Show: — Everything — Updates New Groups Group Memberships Group Updates SIG03 Coordinator joined the group SIG-03 Aperiodic Crystals 8 years, 7 months ago SIG-03 Aperiodic Crystals Visit group