Likely a sterile medium means an uncontaminated culture (food free of living organisms) that will grow only the new bacteria introduced for analysis. Source(s): http://www.thefreedictionary.com/sterile
Stonepelt was Bluestar's first mentor and a very well-respected senior warrior of ThunderClan. It is revealed in this book that he took her to the Gathering on her second day as an apprentice because she had caught a squirrel very well for a new apprentice, and the squirrel had been as big as she was.
Khajiit are cat-like people who come from Elsweyr, known for high intelligence and agility. These traits make them very good thieves and acrobats, but Khajiit are also fearsome warriors. However, they are rarely known to be mages. Khajiit mostly stay on land, but piracy and skooma trade does draw some to work as sailors.