Equations That Changed the World – A5 Black Paper Notebook
$21.00 USD Or available in 4 easy payments of $32. See checkout for details.
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Free Shipping
We offer free shipping on all orders over $125, see checkout for additional details.
Easy 30 Day Returns
Orders can be easily returned, or exchanged for a different size, color, or style within 30 days, through our return portal. Learn More
Shopping online means you can't try it on first. We get that. If something doesn't work, we'll make it right.
The basics:
- 30 days from delivery to start a return or exchange
- Items must be unworn, unwashed, and in original condition with tags attached
- Sale items are final sale — no exceptions
- Gift cards and select grooming/personal care items are non-returnable
Exchanges:
We'd rather get you the right thing than give you your money back. If you need a different size or color, start an exchange and we'll get the right one out to you.
How to start a return or exchange:
Email us at info@thesimplemanstore.com with your order number and what you'd like to do. We'll take it from there.
Refunds:
Once we receive and inspect your return, we'll process your refund within 5–7 business days back to your original payment method. You'll get a confirmation email when it's done.
We offer free shipping on all orders over $125.
Return shipping:
Return shipping is the customer's responsibility. We recommend a trackable service for anything over $75. Ship returns to:
8712 Pacific St, Omaha, NE 68114
Questions?
Email info@thesimplemanstore.com or stop by the shop.
Write Like a Thinker
Inspired by the minds who redefined how we see the world, the Equations That Changed the World notebook is a tribute to innovation itself. Designed for those who think deeply—whether you’re sketching formulas, journaling thoughts, or drafting ideas that just might change the world too.
Premium Details, Thoughtfully Made
This A5 softcover notebook features smooth black paper that pairs beautifully with gel pens, metallic inks, and white markers—turning each page into a creative contrast. The alternating dot grid and lined layouts make it ideal for note-taking, journaling, sketching, or bullet journaling.
A lay-flat binding makes writing effortless from edge to edge, while the soft-touch textured cover feels as good as it looks. Keep your thoughts secure with a sturdy elastic strap closure, and enjoy the subtle pop of color from the tinted page edges.
Sustainable, Global Quality
Every notebook is designed with the same care as the ideas that fill it:
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Size: A5 (5.8” x 8.3”)
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Pages: 208 (104 sheets)
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Paper Type: Black, alternating dot grid & ruled
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Paper Weight: 81gsm, acid-free
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Composition: 100% recycled, 100% post-consumer waste
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Ink: Soy-based
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Origin: Designed in Oregon, paper milled in Japan, assembled responsibly in China
For Makers, Thinkers & Dreamers
Whether you’re an engineer in Omaha, a student in New York, or a designer in Tokyo—this notebook is built for those who think in sketches, equations, and big ideas. Perfect as a thoughtful gift for creatives, students, or anyone who values well-made stationery that stands apart.
