sorry for asking if it's already asked. I could not found when I search.
Here is the situation.
If I want to log-out from SO with current id, and then another guy want to log in to SO with their account, we need to clear the browser cookie and cache.
Otherwise, when I log-out and try logging in, it will automatically log in with older account.
Why is that so? Why not all session and other information are not removed when we log-out?