Upon first impression of any new individual you may meet, you immediately form an opinion. You may not even converse with them, but you can tell within a few moments as to whether or not you feel good around this person. An individual's personality is literally written into the energy surrounding themselves. Similar to pheromones, an aura emits a vast amount of personal information. Without even being psychic or having the ability to see auras, your natural instinct can guide you when sensing another's energy signature.

Read more at: http://www.ufodigest.com/news/1107/emotion3.html.