The current Ask the Doctor is always displayed in the Spotlight section. It remains there until the following month at which point it is archived into the Ask the Doctor section. I have had several questions about this, so please always check the Spotlight section first for the most current Ask the Doctor.
http://www.stemcellpioneers.com/showthread.php?t=7172
http://www.stemcellpioneers.com/showthread.php?t=7172