Discovery Channel - "the top 10 unexplained mysteries"

As to "pure energy", it is somewhat of a colloquial term, a term for the masses. I am not a physicist, but I have heard the term loosely used when describing matter/anti-matter, as in "If one atom of matter hits another atom of anti-matter the result is pure energy". In this case, the resultant is only energy and no mass, so maybe not exactly what you are talking about. Energy itself is not directly observable, but it's effects on matter can be observed.

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Perhaps someone can translate for me then what really happened at the start of the universe and what was really there?

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If I could I would win the Nobel Prize.My understanding is at the very start of the universe there was positive energy, negative energy, matter, and anti-matter. At the very, very start of the universe, there was just energy because the heat involved did not allow the formation of matter (or anti-matter). However, most theorize that the overall energy content was zero, being that gravity is considered negative energy. Just a slight increase of matter over anti-matter (through some undiscovered mechanism) allowed the formation of the physcial universe. Again, I am not a physicist, so don't take this as the final word.

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Well, whatever pure energy is, whether it's real or just a form of measurement, etc. it's an interesting concept from the viewpoint of the after life.

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More than likely, when people claim that the person they see is "pure energy" they are equating their visions with stuff they watched on Star Trek. Previous cultures might have called it a "Ball of Fire" or "St. Elmo's Fire". I think pure energy is meant as a descriptive tool instead of a diagnostic tool. It isn't like people are measuring the being with their tricorders or anything