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.
Ancient Greek warriors became the premier warriors of their classical world. Through intense internal warfare, they perfected heavy infantry tactics, and when they were united, they were able to defeat an invasion by Persia, the super-power of their day. A Greek hoplite warrior.