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#### 如果你是个巨人...

What If You Were A Giant?

Vsauce, I’m Jake and after watching the movie The BFG, I decided that I wanted to be

a giant, naturally. So I created this make shift lab

to make a potion that’ll do just that…but before we begin…let’s find out some facts about what would actually happen

if you…were a giant.

The BFG is 24ft tall, taller than a T-Rex. However, we can’t just scale a normal person

up by a factor of 4 do to the square-cube law which states

Here I made a graph, (side note) I have a lab now so I’m into graphs and bunsen burners,

and you can clearly see that as our mass increases from a factor of 0 to a factor of 4 our muscles,

bones, and organs don’t strengthen concurrently. So your legs wouldn’t be able to support

the weight of the rest of your body and that wouldn’t be great for your enthusiasm for

living.

We can see this to a degree with someone we’ve talked about before, the 8ft 11in tall Robert

Wadlow who needed leg braces and a cane to walk.

So the square-cube law is a little bit of a problem for my giant plans, but what if

we were to keep our same weight, a fixed weight, but our atoms are stretched further apart

If that were the case even though your mass is the same your density would be about 15.4kg/m^3,

64 times less than the density of an average human being. Some interesting things would

happen if this were the case. First, you would kind of float through life since your density

is only 12.5 times that of air (1.225 kg/m^3). Now this all sounds well and good but you’d

have to be careful of your new arch enemy…wind. Let’s take a look at the Beaufort Wind Scale.

1 meter per second is equal to 1.9 knots, which is classified as light air. What we

need to be worried about is wind speeds at 10m/s or higher which would bring us to 19

knots, a fresh breeze. When small trees with leaves begin to sway. That would be enough

to whisk you off.

Ok, so let’s scrap that idea and say that our giant self could defy the square-cube

law and wouldn’t buckle under our new weight…which….how much would you weigh? Well, around 4.5 metric

tons, about the same as an elephant or 6 cows. And you’d have to be careful when walking

because although you’d be fine on most surfaces, you’d sink in soil.

Speaking of walking and movement, you’d assume that now that you’re bigger, you’d

move faster. Sadly, earth’s gravitational acceleration doesn’t scale up with you so

it takes longer for gravity to allow parts of your body to fall. Using the froude number

we can calculate that your rate of motion would be half that of a normal sized human,

or an NSH. Meaning you’d walk at 6.2 mph which is double a NSH would but you’d be

taking longer to accelerate.

And that’s not the only thing that’d be slower. Since you’re so much taller, the

electrical signals to and from your brain have a much larger distance to travel but

“velocity factor”, the speed of electricity, stays the same at about 275mph. So you’d

be four times slower at reacting, Think 1 second instead of a quarter second. If you’re

a giant you are probably still thinking because you’d be slower at that too. But at least

you’d be stronger right? Well….yes and no.

Your absolute strength would increase by a factor of 16, meaning you’d be able to bench

14 NSHs or one cow. But because of the square-cube law, your strength to weight ratio has actually

gone down four times, so while our strength would be impressive, it wouldn’t be as strong

as you’d expect. Add to that that you probably shouldn’t be doing too much exercise since

your heart rate would be 29% of normal, about 23 beats per minute down from the average

80. And you really need this puppy to keep the massive amounts of blood circulating and

pumping.

But let’s talk about the positives here: Firstly, you’d have a pretty deep voice.

The resonant cavity in your throat is now larger but the sound speed hasn’t changed,

so your pitch would go down by a factor 4, between 21-45 Hz which sounds like this. Barely

at the lower end of the human audible range, however your pets probably couldn’t hear

you – dogs can hear above 67 Hz and cats at 55 Hz.

The second positive is that according to Kleiber’s Law, how a metabolic rate scales, your metabolic

rate is now 22.6 times greater than normal. Now why is this a positive? Because this means

I need 22 extra orders of tacos whenever I eat. If that isn’t reason enough to be a

giant then I don’t know what is and we are just in time to because my formula is finished.

Now it will either make me giant or make me explode but ya know, go big or go home…in

lots of pieces. Let’s give it a go!

Ooooh, you can immediately feel it and it feels good!

Alright, well I’m gonna do this AND, as always, thanks for wa

【OW】桐