My "How Mastodon Works" discovery for today: If you use the advanced web interface, then do a hashtag search (eg. #archaeology'), if you then click on 'show settings' and click 'pin' on the column where all the toots with a #archaeology are shown, this will create a permanent extra column on your interface with all the toots with #archaeology on them. If you want to get rid of it, just unpin it.