Peer Reviews
Equations that Changed the World Hardcover Notebook - Dot Grid
Item is in stockHurry! Low inventoryItem is out of stock
Item is unavailable
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.
Designed in USA
100% Recycled Paper
Compostable Packaging
Carbon Neutral Shipping
The textured covers of these notebooks have the feel of old textbooks, and with advanced lay-flat pages, they want to fall open, like a well-loved library book. Go ahead and see for yourself – these are the notebooks your most brilliant ideas have been waiting for.
The Hypothesis series is built with high-quality 100% recycled paper and printed with soy inks, leaving a light footprint. Be inspired to ask the right questions, connect the dots (even when they’re really far apart), and keep pushing humanity forward, so that tomorrow is always brighter than today.
| Dimensions | 178 x 229 mm (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 |
| Origin | Designed in Oregon Paper milled in Japan Assembled responsibly in China |
For more information on our paper, see the blog.
Region |
Shipping Cost for orders €40+ |
Shipping Cost for orders less than €40 |
| EU | FREE | €5.95 |
| UK, EEA, Europe (non-EU), Türkiye | FREE | €9.95 |
| Middle East, Oceania, Asia | €35 | €35 |
| South America, South Africa | €40 | €40 |
If you live in the UK, EFTA, or anywhere outside of the EU, taxes and import fees may be due upon delivery.
For orders shipping to North America, use our USA website for quicker transit times and more affordable shipping costs.
Delivery to zip codes that UPS considers to be "Remote" are charged the UPS Extended Service area fee of €30 in addition to the standard shipping rates.
Orders are processed within 1-3 days (Monday-Friday)
Shipping by GLS & UPS 1-5 days
Please double check your shipping address before submitting your order. We are unable to update your address or cancel you order prior to shipping once it is in our system. If your package is returned to us due to an incorrect address or refused delivery, we will refund the cost of the items less a 20% restocking fee if the goods are still in saleable condition. Shipping costs are non-refundable.
To start a return please contact us using the contact form. Returns must be made within 30 days of placing your order.
Frequently Asked Questions
-
We ship from The Netherlands to nearly all destinations within Europe, Asia, the Middle East, Oceania, South America & South Africa. You'll be able to select your country and add your address details at checkout. If you're able to find your country, we can ship to you!
Unfortunately at the moment, because of the current political situation, our shipping carriers have suspended delivery to Ukraine and Belarus, so delivery to these locations is not possible.
For destinations in North America & Central America, please visit our USA website.
-
Region
Shipping Cost for orders €40+
Shipping Cost for orders less than €40
EU FREE €5.95 UK, EEA, Europe (non-EU), Türkiye FREE €9.95 Middle East, Oceania, Asia €35 €35 South America, South Africa €40 €40 If you live in the UK, EFTA, or anywhere outside of the EU, taxes and import fees may be due upon delivery.
For orders shipping to North America, use our USA website for quicker transit times and more affordable shipping costs.
Delivery to zip codes that UPS considers to be "Remote" are charged the UPS Extended Service area fee of €30 in addition to the standard shipping rates.
-
We do our best to pack up orders within 1-2 business days. Orders ship via GLS or UPS depending on the weight and destination. Most orders arrive within 1-8 business days.
-
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.
-
No problem! We offer full and partial refunds and exchanges. Read more here.
-
Due to the way we make our products, we are unable to customize single items. In general, we cannot change the kind of paper in the notebooks from what you see listed or change the colors, but we are always happy to hear what you'd like to see us make in the future!
Further Research
Let customers speak for us
The most authentic mug for a cardiologist
I am very happy with this finding, this mug makes a perfect gift. The team at cognitive surplus was very helpful and did not hesitate to replace the mug that had a little defect. I am very greatful to them.
Doina S.
Heartbeat 450 mL Ceramic Mug
I ordered a moth scarf, it was swiftly delivered. The scarf is comfy, made of quality cotton and I absolutely love it!
Anežka S.
Anatomical Heart Washi Tape
Super good quality! Loved the print and the size of the bag, definitely recommended!
Errika D.
Brain Anatomy Canvas Shoulder Tote Bag
Lovely product
Good quality and perfect print for my paleo nerdom
Highly Recommend
The notebooks are really pretty with robust quality. Great paper and smooth print. Loads of ready templates. Excellent overall.
Raghad A.
Optical Engineering Lab Notebook
I absolutely love this bottle. It keeps my water so nice and cold during the day at work, and I've received so many compliments. It's very sturdy and the quality feels great.
Jennifer E.
Woodland Forest 950 mL Steel Bottle
Heartbeat Drinking Glass
Tereza F.
Heartbeat Drinking Glass
Ancient Egypt and stationery? Count me in!
Along with dinosaurs, ancient Egypt has been a passion since I was a little kid. And as a journaler, this was a must have. Beautiful to decorate my spreads.
Susana C.
Hieroglyphics Washi Tape
Beautiful Tote bag
The bag is stunning. I bought the one with the botanical plants on it and I love the drawings of the plants. Also the colour mint green is beautiful. Very nice product!
Anonymous
Medicinal Botany Canvas Shoulder Tote
wonderfull bag
The bag is absolutely genius. The design is exactly as described and the quality is very good. I bought it as a present and i am sure it suits best.
Lina M.
Retro Microbiology Pencil Case
Beautiful pattern
I am a sucker for mushrooms. I find them so pretty and magical, and very very important for the ecossystem. There is something mesmerizing about them. And so I had to get one of these pretty tote bags, but it was hard to choose one. I went or the one that was more Autumny, and perhaps in the future I'll get another tote bag with mushrooms. The material is quite good and the print is lovely.
Susana C.
Mushrooms Canvas Shoulder Tote Bag
Great quality and amazing customer service
Big thanks to Breanna from customer service, who helped me correct delivery details and provided very professional assistance.
Julia B.
Brain & Neuroscience Spiral Notebook
Fast and secure delivery
Great Design and Quality
Superb quality and cool design. Super swift and efficient dispatch. Very friendly customer service. Great products for the scientist in your life.
David H.
Genetics & DNA Drinking Glass
These Notebooks Are Superb!
Highly recommended. Very good value. Well bound. Good quality cover and paper. Prompt Delivery. These notebooks are just great - exactly the same engineering paper I used at university over 40 years ago! I also like very much the “thematic” selection options. I ordered two books from four engineering themes. My wife is a neurologist, and I also ordered a number of notebooks and other materials for her.
