Equations that Changed the World Hardcover - Dot Grid

$ 19.95

This deep blue and burnt orange notebook is inspired by the equations that have changed the world. The Pythagorean Theorem, five regular solids, the Theory of Proportions, sphericity of the Earth, are just a few among many scientific and mathematical discoveries credited to the early Greek philosopher Pythagoras. Channel his innovative spirit as you take notes in this hardcover journal from your physics class, graph your findings or keep track of your data.

7" x 9"
Page Count
192 pages (96 sheets)
Paper Type 5mm Dot Grid
Paper Weight 81 gsm
Binding Lay-flat Hardcover
Paper Composition 100% recycled
Printing Soy-based ink
Generation 4th


For more information on our paper, see the blog.

When your order arrives, open it up and take a look. If anything isn't as expected, got damaged in transit, or doesn't fit properly, let us know and we'll make it right.

Flat Rate $5.95
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Customer Reviews
4.6 Based on 5 Reviews
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Jessie G.
Australia Australia
Good present!

Beautifully crafted notebook! Good thick paper, and big sized notebook, very happy :)

A Cognitive Surplus Customer
Dallass P.
United States United States
Easy Writer, Aestheticly Awesome

I really like this notebooks. It makes it that much more pleasing with the cover being of the field you are writing in. The books are very easy to open and you don't have to fight the pages back to write in. Very smooth writing surface. Pages are thicker than most notebooks or at least feels like it. Erasing is very nice as well.

Justin W.

Per usual - Love love love

Dave B.
Great notebook again, but again, the paper is a disappointment

This is my second Cognitive Surplus notebook. The first one did not react well to fountain pens. I was hoping that was a fluke, and ordered another, this one. Again, a very attractive notebook. I'm impressed with the construction and the covers, are of course very well done indeed. The notebook lays flat, the signatures allow this easily. The book mark is plenty long enough. I got the dotted one and the dots are visible enough to be used as a guide but light enough to be unobtrusive. However, like the previous notebook, most fountain pen nib and ink combinations bled through the paper. Broad and Medium nibs were of course the worst offenders sometimes depositing ink on the following page. The only combination that worked for me was a Platinum Preppy with an extra fine nib. It's scratchy but it works. To be fair, the notebook is advertised to work best with fine nibs, but I had to go to extra fine to avoid bleed. This seems extreme for a notebook that advertises fountain pen friendly paper. Based on my experience if you prefer a dry ink, and dry writing extra fine nib, you will have no problem at all using this notebook. A pencil with a 0.7 diameter lead, a ball point pen and a Pigma Micron 03 (.35mm fiber tip) black ink, all did well in my tests. So if you are not a fountain pen user, there is no reason not to purchase one of these, as I said, they have beautiful covers and are well made.


The notebook I received is beautiful! My order was shipped on the same day as my purchase date, so overall, I am very pleased and impressed with both the level of service and the quality of the notebook itself. Thank you!

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