Every Unsolved Prime Number Problem

Brocard’s Conjecture Twin, Cousin, and Sexy Primes Palindromic Primes Euclid Numbers Goldbach’s Conjecture Brocard’s Conjecture A prime number is a positive whole number that…

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Every Unsolved Geometry Problem that Sounds Easy – Part 2

Five More Geometry Problems That Are Way Harder Than They Look Tripod PackingThe Thomson ProblemThe Levi-Hadwiger ConjectureHeesch’s ProblemKalai’s 3ᵈ Conjecture Tripod Packing Let’s start…

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Unsolved Problems in Graph Theory Explained

Graph theory has uncovered many secrets of networks and relationships, but some problems remain unsolved. Here are three famous unsolved problems in graph theory,…

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Every Weird Temperature Scale Explained

Celsius Fahrenheit Kelvin The Obscure Temperature Scales Celsius Anders Celsius. Public domain, via Wikimedia Commons In its simplest definition, a temperature scale uses numbers…

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Every Weird Measurement System Explained

One of the oldest surviving documents is an ancient Mesopotamian tablet that details a complaint by a customer who was sold 1,080 pounds of…

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Fibonacci and the Birth of Modern Math

Leonardo de Pisa Fundamentally Changed Math Discovering the Fibonacci Series Ancient Indian Discoveries in Sanskrit Texts The Golden Number (Phi, φ) The Golden Spiral…

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Every Non-Newtonian Fluid Explained

What Is a Non-Newtonian Fluid?Time-Independent Non-Newtonian FluidsTime-Dependent Non-Newtonian FluidsThe Mathematical ChallengeRheological ModelsReal-World Applications and Open Problems What Is a Non-Newtonian Fluid? A non-Newtonian fluid…

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The Fastest Way to Travel is not a Straight Line

What Is the Brachistochrone?The ChallengeThe Calculus of VariationsDeriving the SolutionThe Cycloid What Is the Brachistochrone? One of the most fascinating problems in the history…

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Every Unsolved Geometry Problem that Sounds Easy

Five Geometry Problems That Look Simple but Remain Unsolved Square Packing Bellman’s Lost in a Forest Problem Ulam’s Packing Conjecture Lebesgue’s Universal Covering Problem…

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