Our whole universe was in a hot dense state,
Then nearly fourteen billion years ago expansion started. Wait…
The Earth began to cool,
The autotrophs began to drool,
Neanderthals developed tools,
We built a wall (we built the pyramids),
Math, science, history, unraveling the mysteries,
That all started with the big bang!

“Since the dawn of man” is really not that long,
As every galaxy was formed in less time than it takes to sing this song.
A fraction of a second and the elements were made.
The bipeds stood up straight,
The dinosaurs all met their fate,
They tried to leap but they were late
And they all died (they froze their asses off)
The oceans and pangea
See ya, wouldn’t wanna be ya
Set in motion by the same big bang!

It all started with the big BANG!

It’s expanding ever outward but one day
It will cause the stars to go the other way,
Collapsing ever inward, we won’t be here, it wont be hurt
Our best and brightest figure that it’ll make an even bigger bang!

Australopithecus would really have been sick of us
Debating out while here they’re catching deer (we’re catching viruses)
Religion or astronomy, Encarta, Deuteronomy
It all started with the big bang!

Music and mythology, Einstein and astrology
It all started with the big bang!
It all started with the big BANG!

It’s a so called popular science book by Stephen Hawking, its an attempt to explain a very wide range of subjects in cosmology. It talks about BigBang, Black Holes, Stars, Time, etc.

I think that the more interesting concept for me was the one of Light Cones, it really helps you to understand many things!

I also remember that previous to that book I had the idea that time travel was possible  (I still think that time pseudo-travel to the future will be possible, but definitely not to the past), and the solution to the question was soooo simple: If time travel were possible, we would be full of visitors from the future, and we are not! It was so simple that I was blind to see it.

I really recommend it.