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 The bit about the "nasal compass" looks very suspect to me. If whoever wrote this can't provide a source (a scientific paper demonstrating that the nose compass exists) I think it should be deleted. (1) The whole human body, not just the nose, contains iron (in compounds, not as metallic iron) (2) iron only functions as a compass when magnetized (3) human beings are actually not good at orienting themselves and in a featureless landscape eg a desert will tend to go round in circles, which they would not do if they possessed a built in compass (4) other species tend to use (as far as we can tell) stars, the sun, and features in the landscape for navigation, not magnetic north (5) the magnetic poles wander over time, and the earth's magnetic field reverses from time to time.