劇集 | 生命的奇蹟（2013） | 導航列表
This creature is a wonder of life.
A voracious predator,
this male has lived underwater for nearly five months,
它捕食 成長 爲此刻做準備
feeding, growing, preparing for this moment.
He's about to undertake
one of the most remarkable transformations in the natural world.
From aquatic predator...
to master of the air.
The brief adult life of a dragonfly
is amongst the most energetic in nature.
Dragonflies are the most remarkable animals.
You can see their incredible agility in flight
just watching them skim across the surface of this pond.
They can pull two and a half G in a turn,
and they can fly at 15 mph,
which is fast for something that big.
They've been around on earth
since before the time of the dinosaurs.
And in that time they've been fine-tuned by natural selection
to do what they do
which is to catch their prey on the wing.
So, dragonflies are beautiful pieces of engineering.
They're intricate, complex machines.
But is that all they are?
Because once their brief lives are over,
their vitality will be gone.
And this raises deep questions.
What is it that makes something alive?
And how did life begin in the first place?
So, what is the difference between the living and the dead?
What is life?
I've come to one of the most isolated regions of the Philippines
to visit the remote hilltop town of Sagada.
It's a two-day drive from the capital, Manila,
over some of the country's roughest roads
that wind their way 1,500 metres up into the hills.
This is a place where the traditional belief
is that mountain spirits give us life,
and that our souls return to the mountain when we die...
And where the people who live here still imagine
that the spirits of the dead walk among the living.
Tonight is November 1st, and here in Sagada
in fact across the Philippines
that means it's the Day of the Dead.
That's the day when people come to this graveyard on a hillside
and, well, celebrate the lives of their relatives.
The people light fires to honour and warm the departed,
inviting their souls to commune with them.
Now, not matter how unscientific it sounds,
this idea that there's some kind of soul
or spirit or animating force
that makes us what we are
and that persists after our death is common.
Virtually every culture,every religion,
has that deeply-held belief.
And there's a reason for that. Because it feels right.
I mean, just think about it.
It's hard to accept that when you die
you will just stop existing.
And that you are, your life, the essence of you, is just
really something that emerges from an inanimate bag of stuff.
Don't get too close.
You can see that these people feel
not only do they come to celebrate the lives of their relatives,
but they're coming in some sense to communicate with them.
Their relatives, even though their physical bodies have died,
are still in some sense here.
When you think about it, that's not so easy to dismiss.
If we are to state that science can explain everything about us,
then it's incumbent on science to answer the question.
What is it that animates living things?
What is the difference between
a piece of rock that's carved into a gravestone and me?
For millennia, some form of spirituality has been evoked
to explain what it means to be alive,
and how life began.
It's only recently that science has begun
to answer these deepest of questions.
In February 1943, the physicist Erwin Schrodinger
gave a series of lectures in Dublin.
Now, Schrodinger is almost certainly most famous
for being one of the founders of quantum theory.
But in these lectures, which he wrote up in this little book,
he asked a very different question - What is life?
And right up front, on page one,
he says precisely what it isn't.
It isn't something mystical, says Schrodinger.
There isn't some magical spark that animates life.
Life is a process.
It's the interaction between matter and energy described
by the laws of physics and chemistry.
The same laws that describe the falling of the rain
or the shining of the stars.
So, the question is,
how is it that this magnificent complexity that we call life
could have assembled itself on the surface of a planet
which itself formed
from nothing more than a collapsing cloud of gas and dust?
the answer had to lie in the way living things process
one of the universe's most elusive properties-
Energy is a concept that's central to physics,
but because it's a word we use every day,
its meaning has got a bit woolly.
I mean, it's easy to say what it is in a sense.
Obviously this river has got energy
because over decades and centuries
it's cut this valley through solid rock.
But while this description sounds simple,
in reality things are a little more complicated.
For me, the best definition is that
it's the length of the space time four vector in the time direction,
but that's not very enlightening, I'll grant you that.
Over the years, the nature of energy
has proved notoriously difficult to pin down.
Not least because it has the seemingly magical property
that it never runs out.
It only ever changes from one form to another.
Take the water in that waterfall.
At the top of the waterfall,
it's got something called gravitational potential energy,
劇集 | 生命的奇蹟（2013） | 導航列表