Continuity mistake: Throughout the film, Tony Stark's chest ring can be seen glowing through his shirt except for two occasions when it's suddenly off - after Loki escapes from the helicarrier, and when Loki and Tony Stark are talking in Stark tower, even when he's wearing the same shirt. (01:35:30)
Natasha Romanoff: This is the Tesseract, it has the potential energy to wipe out the entire planet.
Bruce Banner: What does Fury want me to do, swallow it?
Trivia: Mark Ruffalo is the only actor to be credited as both Bruce Banner and the Hulk.
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Answer: While Loki is not immortal, he's just as powerful as Thor, and many mortals would consider him a God as well. Loki is actually a Frost Giant taken in by Odin, but is just as invulnerable to many attacks. There may also be an element of magic involved in his survival as well.
Bishop73