More often than not, when I see that I have a number of alerts, I address the list from the bottom up. The Alerts red flag goes away and I happily serf the site. The I get a red flag that says I have 2 Alerts. I click on Alerts and see that not only do I have 2 unanswered Alerts, but I have the long list of Alerts that I previously answered. How can I make these Alerts disappear after using them?