Equations that Changed the World Hardcover - Dot Grid

$ 24.95

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.

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Customer Reviews
4.8 Based on 11 Reviews
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Mabel R.
United States
The Perfect Notebook

I love these notebooks so much! Perfect size. The dot grid is so light they’re basically unlined. They really do lie open on their own without flopping back closed. The hardcover makes them super-durable. I buy a new one for every project I start. Plus such fun graphics!

Adam S.
United States United States
this review

The best part of this journal was the quality of the quality; the worst part was having to write this infernal review.

Ada W.
United States United States
Awesome Notebook!

I first saw these notebooks at a science conference in Seattle and did not buy one then- and what a mistake that was! I recently ordered this notebook to journal in and it has so far surpassed my expectations. The cover is beautiful and interesting, and the pages are very good quality. My pen does not bleed through at all. Overall a very nice notebook that I would highly recommend!

Gustavo M.
United States United States
Beautifully designed and made

This was the first Cognitive Surplus notebook that catched my eye and I made no mistake ordering it. It is beautifully designed and made. I'm sure I will enjoy it for a long time. Highly recommended.

Sarah C.
United States United States
Familiar and Foreign

It's hard to describe why I like these designs when the first thought that comes to mind is, "I just like it." It makes me wish this was available during high school to convince me I could love art and science together, or pursue creative writing and STEM at the same time without a conflict of interest. At least I know the truth now! You can indeed love both.

A Cognitive Surplus Customer
Kadisha V.
United States United States
Best Notebook I Ever Had

The dot grid lining is certainly an adventure to use. It doesn't take away as easily from the challenge of writing straight in the lines like I thought it would with its minimalist outline, and it looks cleaner, putting more focus on your writing than the lines between. Like a succinct method of organizing your thoughts. Then there's the lovely, neat feel of the notebook, itself. The creation of the hardcover was amazingly handled, and the designs are lovely, like a collage of artworks that stand out separate from one another but also blend in with one another like the best piece of "white noise" visuals I've ever had the pleasure of laying my eyes on. Overall, because the paper has the added bonus of not smudging all that easily, from what I have observed thus far, these notebooks, if all made in the same quality (which I don't doubt - the creators of these books know what they're doing), deserve their five star ratings. 10/10 would buy, again. I'm excited to try buying some more come the Fall semester.

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.

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