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Hey, Vsauce, Michael here. A single
piece of refined flour is on average
just 82.67 microns wide. That means a 5
lb bag of flour contains about 2.7
billion individual specks of flower
dust. Now, if each of those particles
were a person, three bags could
represent every single human alive on
Earth today. 8.1 billion itty bitty
things. Are you under 30 years old? Is a
question that could roughly divide
everyone alive today in half, the yeses
and the nos. But can you imagine a
second question that could then divide
both of those groups in half? Well, if
so, and if you kept doing that, after
just 33 questions, you would be left
with more than 8 billion groups, each
containing just one person. In other
words, out of everyone alive today, we
could pinpoint a specific individual,
for example, you, with just 33 yes or no
questions. What would those questions
be? Do they even exist? We don't know.
But we do know that every year about
this many people die. A little bit more
than a/4 cup. But about twice as many as
that are born. But how many people have
ever been born? This many. 117
billion. But out of all of these people,
out of everyone who has ever existed,
this is how many you will ever meet. You
are a stranger to your own species. This
is a video about how you will be
forgotten. It's about the ghosts that
surround us and how they're getting
closer.
Our journey begins 2500 km above the
surface of the sun. There, a hot layer
of ionized gas begins its reach millions
of kilome out into space. It's called
the solar corona. And normally it's
outshon by the rest of the sun because
it gives off just 1 millionth as much
light. But during an eclipse it can be
seen. When you are eclipsed your own
sort of corona will remain as well. The
memories people have of you. Your
treasure and junk. Emails and texts you
sent. The fact that your child has a
nose like yours. Every appearance you
made in the background of a stranger's
photo. Those are all traces of you that
shine while you're alive, but can also
continue long after you're gone. Douglas
Hoffetter called them your solar corona.
I love that phrase because it makes a
cosmological phenomenon personal by
literally including you.
How long will you be here? Well, that's
why I made this clock. It tells the
time, but it also tells your time. Just
answer a few questions and then when
it's ready, push the red button and the
clock will begin counting down the
seconds you have left to live
approximately. Now, whenever you want,
you can switch it to show the time. But
that's not nearly as fun. Also, this
clock never forgets. If you take away
its power, it'll go dark, but it's still
thinking about you. Next time you plug
it in, it will pick right back up where
it should be. Now, if you would like a
practical retro momento mori, you can
pre-order one of these now. Omnis
vulnerant ultim nat is Latin and it
refers to these passing seconds. It
means each of these wounds the last
kills. Mox knocks means soon it will be
night and it will. But while this is
ticking down, something else is ticking
up. The number of ghosts in the world.
Your nominal ghost is your name. It's
out there representing you whether
you're there or not. It won't haunt the
world forever. Though, as we've often
been reminded, you die twice. Once when
your heart stops beating, and then
again, usually sometime later, when your
name is spoken for the last time. But
whose name has been remembered the
longest? Well, signed here on this
5,000-year-old tablet is the oldest
written name we've ever found. Kusham,
the first named character we know in the
written history of humanity. Probably
it's not entirely clear whether Kusham
is the name of a person or just the
title of an office holder. You know, if
you want to be really sure, a generation
or two later, this tablet was made. It
contains three names. G Saul and two
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