Top products from r/theydidthemath

We found 27 product mentions on r/theydidthemath. We ranked the 215 resulting products by number of redditors who mentioned them. Here are the top 20.

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Top comments that mention products on r/theydidthemath:

u/catsandtoucans · 6 pointsr/theydidthemath

I’m not so good at math, but I do know something about stuffed animals, if you want to go at it from that route.

Teddy bears don’t come in that many sizes. You generally get something around 11-12”, something around 14-16”, and then 24” and up. This bear is definitely not going to be in the 24” and up category. Many teddy bears are manufactured by GUND, Aurora plush, or Vermont Teddy Bear Company. This doesn’t look like a Vermont bear, but GUND and Aurora may have something similar. I also did some searching and found that some Bearington Bears look similar to this one.

Here are some bears on Amazon that I thought looked fairly similar:

Hope this helps!

u/Dereliction · 4 pointsr/theydidthemath

Human ability to reproduce may not really be the limiting factor to consider. How well agricultural practices were able to support a given population and that rapid of a growth rate, for example, might be more informative. And were there even 19.3 million people in 2300-1800 BCE?

There should also be some evidence of an origination point where these 19 million Noachian people originated and immigrated outward from--hypothetically some indication of higher densities of population during that era from which individuals and groups began to steadily move away from, toward better prospects and less competitive environments.

(EDIT: McEvendy and Jones, authors of the Atlas of World Population History, estimate 27 million people in 2000 BCE.)

u/DarrenFromFinance · 2 pointsr/theydidthemath

I am going to strongly recommend that you read a book that might help you deal with the scale of the universe, and that is The Five Ages of the Universe, which takes you from the inconceivable tininess of the beginning to the unfathomable immensity of the far future, and imparts a sense of wonder and hope to the whole thing: it is possible that, no matter how big it gets, how far apart everything is, how dim the lights become, complex life can still exist and thrive. The book is like $10 for your Kindle and it's glorious.

u/MiffedMouse · 2 pointsr/theydidthemath

The computer with the best memory used during WWII (that I could find after just a few minutes of searching) was the Collossus, with around 6kB of data. The Z3 is the largest German computer and is just a little bit behind, but still rounds out to around 6kB. Here is an image of it next to a human:

Assuming the human is 6' tall, the computer has approximate dimensions: 6' x 6' (there are two cabinets) x 1'.

If we stack the computers so they are flat against each other (the closest linear packing we can achieve) we get 20,000 miles / 1' = 106 million Zune Z3 databanks. This works out to approximate 600 gigabytes of data. This would fit in the horribly expensive, one terrabyte Kingston Datatraveler:

So... yes.

UNLESS we can put computers side-by-side. (20,000 miles is a unit of length, not volume). This Scientific American article puts the human brain data storage at approximately 2.5 petabytes (2*10^15 bytes):

If we put the Zune Z3 databanks in 4000 "columns" (for a total width of 4.6 miles) we can fit 2.5 petabytes, which is significantly more than any modern flash drive.

In fact, storing the 2.5 petabytes on a single system would require the 20 pB Titan supercomputer that debuted 2 years ago:

TL;DR: Yes if it is a single file column of machines, no if you actually have enough machines to store a human brain (which is 4.6 miles wide x 20,000 miles long).

u/NottherealOG · 1 pointr/theydidthemath

This is an interesting question and comes with many answers depending on how you define certain things like "poverty". IMO, the best answer is given by Jeffery Sachs in this book. He says that if we used $175 billion per year for 20 years, we could end extreme poverty.

u/hypatiataggart · 6 pointsr/theydidthemath

According to The Gospel Coalition Jesus was likely around 5’1” and 110 lbs.

These commercially available communion wafers weigh 0.005 oz each (box of 1000 weighs 5 oz.)

110lbs * 16oz / 0.005oz per communion wafer = 352,000 communion wafers.

To go a bit further and see how long it would take one person to receive communion this many times...

Let’s assume this person is a dedicated church attendee and attends weekly as well as all of the extra church services including Christmas Eve, Christmas, Shrove Tuesday, Ash Wednesday, and Maundy Thursday (in my experience communion isn’t offered at Good Friday service Easter is always on a Sunday and therefore not an extra church service.) This means 57 services per year. 352,000 / 57 = 6,175 years of devout church attendance to receive the entire Body of Christ.

u/Machina581c · 1 pointr/theydidthemath

With regards to the blog post:

Your point was to create a distinction between students and working social scientists, which is unfounded given the highlighted segment of the post.

With regards to using personal experience as evidence:

I brought it up once, to meet you half on your emphasis on personal experiences. It was not intended as evidence or proof or anything of that sort.

I am not so foolish as to think my own experiences are inherently generalizable.

With regards to having no sources:

At the moment I have three, and to counter I have "No, I've seen different".

But alright, if you wish more:

Anyway, this discussion has clearly become pointless. You refuse to acknowledge any evidence that doesn't fit into your personal narrative and keep attempting to assert what I'm saying is ridiculous to dismiss my point.

But on the plus side, your argumentation has fully convinced me you're a social scientist.

u/AuraMasterNeal · 54 pointsr/theydidthemath

Let's assume to describe a 'thing' that Jesus did, it requires 1 verse of a Bible (it's Easter, why not use Bibles). According to Wikipedia, there are 31102 verses in the Bible. This NKJV Bible on Amazon is 7.9"×5.2"×0.9", or 605.86253 mL. Let's assume "the world would not have room" means that the things would not fit within the atmosphere of earth. Assuming perfectly spherical earth with radius 6,371 km, and "within the atmosphere" means up to the Karman line (100 km up), we have

4×π/3 × (6471km)^3 = 4π/3 × (6371km)^3 + b × 605.86253 mL

Where b is the number of Bibles. Plug it into Wolfram we get b=9.903×10^(22) things. Assuming 40 years of life, he did 7.851×10^(13) things per second, or 78.5 trillion things per second.

u/Slip_Freudian · 25 pointsr/theydidthemath

Don't fret!

Calc and the higher maths are like a video game on paper.

This is a good intro and quite the stirring read.

u/Isgrimnur · -1 pointsr/theydidthemath

To really get a good feel for how big stuff really is on comparison, I recommend The Measure of the Universe by Isaac Asimov.

u/marcodr13 · 15 pointsr/theydidthemath

Not directly answering OP's question, but Randall Munroe from xkcd has treated the subject of a "real life periodic table" and its consequences in his What if? book. He also talks about it in a Talk @ Google. I highly recommend to take the time and watch it.

u/what_a_cat_astrophe · 6 pointsr/theydidthemath

There are technically 11 wizarding schools worldwide! There's all this background lore not directly mentioned in the series, but in the other littler stories like Tales of Beetle & The Bard (the children's book left to Hermione by Dumbledore that contained the story about the Deathly Hollows).

u/excral · 2 pointsr/theydidthemath

You can read ch. 1 as a free sample on the amazon page of the book.

u/differentiallity · 1 pointr/theydidthemath

For $915 each, you could get [1 TB flash drives] ( I would assume that you could fit at least 20 of these in the space of 1 4 TB 3.5" hard drive. That would mean you could get 20 683 TB, or 13.660 Petabytes. Now, the latency would be terrible with a tesla as the google fiber would transfer at the speed of light in glass, which is [about 200,000 km/s] ( Distance from NY to LA is 2776 mi according to google maps which is 3663 km. 3663 km / 200,000 km/s = 0.018 seconds to transfer one bit. So for the tesla, you get a latency of 41 hours but a data transfer rate of 13.66PB 10^6 GB/(41h*3600s) = 92.55 GB/s. Google fiber has a latency of 0.018 s but a data transfer rate of 1GB/s. So, you would get a 92.55 times greater data rate with the tesla, but if you decided you had to change your data, it would take a long time to turn your tesla around.

u/GreyStomp · 3 pointsr/theydidthemath

To add insult to injury, Walmart sells 36 pudding cups(buy in bulk dude, you're filling a pool) for $22.95 USD. So if you go on the cheap end and use 1,800 cups you'll only have to spend a cool $1,417.50 USD.

Now I'm no expert in budgeting my money but I'd say you'd be pudding it to good use.

u/TQFCLordUniverse · 2141 pointsr/theydidthemath

According to this amazon product description a single wafer would weigh about 0.32g.

According to this guy‘s page Jesus height might have been 5' 10" and his weight may be around 142 pounds. —> 64,41 kg

x = amount of wafers

0.32g * x = 64,41kg or 64410g


x= 201281.25

You would have to eat around 200k of them.

If you went to church each week and ate exactly one wafer (52 a year) - you would NEVER eat a whole Jesus in your entire life.

u/underpantsbread · 1 pointr/theydidthemath

On Amazon you can buy a 1000 pack of communion wafers. According to the nutrition facts the mass of 1 piece is 0.32g. (


Estimates of the average stature of people at that time would mean he was approx somewhere around 5'2'' - 5'5''. If we assume he was 5'3'' then a reasonable weight (according to most BMI charts) is approx 55kg.

This means you would have to receive communion 171,875 times. If you went to mass every week it would be approx. 3,300 years before you ate Jesus.


Note: I'm assuming total mass (excuse the pun). This includes bones etc. not just the mass of "flesh".

u/filez41 · 2 pointsr/theydidthemath

Well, I don't know how much they cost at a grocery store, but you can get a 36 pack on amazon for $20.99. That's about 0.583 cents per pudding cup.

If you can buy them individually at that price, that's 51453 pudding cups. But since you have to get the 36 pack, 51444 pudding cups plus a few bucks left over.

u/Falterfire · 2 pointsr/theydidthemath

There's actually a story about somebody meeting a decimal child in this nonfiction book.

u/ActualMathematician · 10 pointsr/theydidthemath

You've perhaps heard confusion about the correct answer - it depends on precisely how the question is phrased/assumptions.

" can't be proven mathematically" is incorrect, it's trivial to show, and you don't even need to use mathematics - just enumerate the tree of possible decisions and count outcomes.

There is a nicely done book The Monty Hall Problem: The Remarkable Story of Math's Most Contentious Brain Teaser that goes over the genesis of the problem, the machinations that various persons went through, the mathematics of the answer(s), and variations therein.

Very inexpensive book, and probably at your local library, highly recommended if you want the Full Monty treatment...

u/JAFO_JAFO · 2 pointsr/theydidthemath

I think that a major problem in your estimate is that it isn't including the cost of solar and battery dropping over time.

There is an interesting assertion from Tony Seba regarding fossil fuels and nuclear going obsolete. He's saying that solar & battery are technologies and will continue to drop in price, like they have done for the last 30 years, and that the cost of fossil fuels will continue to be static or rise. When the cost of solar & battery drops below 6c/KWH, it will be cheaper for many people to produce their own power than to buy off the grid, because the cost of delivery of electricity over the grid is around 6c/KWH. There is still a place for utility generation and the main method of production will be solar & battery.

His book [Clean Disruption of Energy and Transportation: How Silicon Valley Will Make Oil, Nuclear, Natural Gas, Coal, Electric Utilities and Conventional Cars Obsolete by 2030] ( ) discusses this in detail.

Here is a [Short presentation] ( and
a [long presentation] ( .

Useful: Nuclear has a negative learning curve for the past 30 years - The more we research and deploy the technology, the more expensive the technology gets. Not sure if Thorium or new technologies are going to change this assertion, or if they can do so before Solar eclipses them completely. Tony lays it out here
Actually, if you have 4 minutes, you can watch this shorter presentation. Deutsche Bank predicts that solar (without battery I think) will be at grid parity by end 2017 - another projection, but very relevant to our discussion.

u/ike_the_strangetamer · 2 pointsr/theydidthemath

I'm right now in the middle of this book Thinking, Fast and Slow that breaks down exactly what is going on in our minds here.

Basically, there's two different systems at work, the fast one and the slow one, and we're the arbiter between. The fast one is lazy. It reads that the store owner gave up $100 and then gave back $30 and lazily reports the loss of $130 (or maybe some other number).

The brain is very accepting of the fast answer. The slow system needs to not only blow a whistle and let us know something is off but then has the job of isolating the numbers, doing the math and figuring out not only where the problem is, but what the right answer is. Making things worse, the slow part is very fragile. If we are tired, sick, or in a bad mood, we're even less likely to bother with the slow thinking.

So it is a riddle because it's trying to get you to trust your fast system over anything else.