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  • Immortality.

  • In movies, kings are always searching for the secret to immortality.

  • But is immortality really a good thing?

  • To a ten year old boy, one year is the same as 10% of his life.

  • To his forty year old mother, one year is merely 2.5% of her life.

  • The same year, 365 days, can feel differently to different people.

  • If we live until we're 82, that's about 30,000 days.

  • If this boy lives for 30,000 years, a year to him could feel like a day.

  • And if this boy's emotions sustain through the potential boredom of living for millions of years,

  • he might become extremely lonely and sad

  • knowing he has and always will outlive everyone he has ever loved.

  • But what if everyone were immortal?

  • Well, first off, Earth is only so big.

  • So, where would we all live?

  • "Excuse me!"

  • "That's my face!"

  • "Stop it!"

  • "Pardon me."

  • "Tight in here!"

  • Do you remember what you did last year?

  • What about when you were five?

  • How much of your past have you forgotten?

  • If you're having trouble remembering what you did when you were five,

  • how will you remember what happened if you were alive a thousand years ago?

  • A million years ago?

  • We don't remember every single detail of our past

  • because our brains have a limited capacity

  • and we replace useless memories,

  • like middle school locker combinations,

  • with relevant information.

  • If this immortal boy finds a companion to fall in love with once every hundred years,

  • he would have ten thousand girlfriends in a million years.

  • And how many of those ten thousand girls' names will he be able to remember?

  • This changes what a meaningful relationship means,

  • doesn't it?

  • Another tricky thing about immortality:

  • Human beings have not always looked the same.

  • This can be explained by Darwin's Theory of Evolution.

  • For instance, if women find taller men more attractive,

  • then more tall men would mate and have children,

  • putting more tall genes in the gene pool.

  • That means, in the next generation, more children will have the genes to be taller.

  • Repeat that process for a million years and the average height will be a lot taller than the average height today,

  • assuming there's no natural disaster

  • that wipes out all the tall people.

  • Our ancestors were short, hairy apes.

  • We still have body hair, but we don't look like apes any more.

  • If you're the only person who is immortal,

  • while everyone else keeps evolving generation after generation,

  • you will eventually look quite different than the people who surround you.

  • "Hi, how you doing?"

  • If one of our ancestor apes is still alive today,

  • how many people will make friends with it instead of calling the Museum of Natural History?

  • And one more physical consideration for immortality:

  • Scars.

  • After all, immortality doesn't automatically translate to invincibility,

  • it just means you cannot die.

  • But it doesn't guarantee what condition you'll be alive in.

  • So, look at your body

  • and count how many scars you have.

  • If you have made this many permanent scars within your life,

  • imagine how much damage you would have if you were one thousand years old!

  • Now, there are approximately

  • 185,000 amputation related hospital discharges every year in the U.S.

  • These injuries are due to accidents or illnesses.

  • Certainly the percentage is low

  • comparing to the total population

  • if you only live for a hundred years.

  • However, if you've been alive for over one million years,

  • the odds of still having all your limbs are pretty slim.

  • What about little accessories,

  • like your eyes,

  • your nose,

  • your ears,

  • fingers or toes?

  • What about your teeth?

  • What are the odds of you keeping your dental health

  • for a hundred years?

  • A thousand years?

  • One million years?

  • You might end up looking like a horribly scuffed up Mr. Potato Head

  • with missing pieces and dentures.

  • So, are you sure you want to live forever?

  • Now, which superpower physics lesson

  • will you explore next?

  • Shifting body size and content,

  • super speed,

  • flight,

  • super strength,

  • immortality,

  • and

  • invisibility.

Immortality.

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B1 中級

TED-ED】超大国が本当だったら: 不死 - ジョイ・リン (【TED-Ed】If superpowers were real: Immortality - Joy Lin)

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    姚易辰 に公開 2021 年 01 月 14 日
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