What was the concept behind the staff that Loki used in the Avengers movie? It contained a blue crystal (presumably a part of the tesseract?) He uses it to put people like Hawkeye under a spell of sorts and also used it to blast stuff.
I assumed that the tesseract could only be used as an energy source. It is evidently not true if the tesseract is used to hypnotize people. Can humans also use the tesseract for such purposes or was Loki the only one who could harness these powers? What additional uses can a tesseract have?