There's a hiccup in the date display for the Biology site, or I've missed out on some criterion that the site has yet to fulfill.
On Area 51, the site is listed in the bright blue box as being in beta for 5 days. When I look on my profile for the site, it says:
visited 7 days, 7 consecutive
Realizing that it's just entering day "#7" by 8 hours or so, but why is there a discrepancy between the two counts?