Featured image of post How Touch Screens Work: Why Glass Can Detect Your Finger's Position

How Touch Screens Work: Why Glass Can Detect Your Finger's Position

The smartphone screens we touch every day. Why can a display that looks like ordinary glass accurately read the position of your finger? We explain the engineering mechanisms behind this familiar technology, such as capacitive touch and the principle of multi-touch.

Featured image of post History of Cryptography: From the Enigma Battles to the Birth of Public-Key Cryptography (RSA)

History of Cryptography: From the Enigma Battles to the Birth of Public-Key Cryptography (RSA)

The history and mathematical principles of cryptography, the foundation of information security. Delving deeply into the trajectory from ancient cryptography to the deciphering of Enigma, and up to modern public-key cryptography (RSA).

Featured image of post Kakeya Conjecture: What is the minimum area required to rotate a needle a full turn?

Kakeya Conjecture: What is the minimum area required to rotate a needle a full turn?

Delving deep into the Kakeya conjecture, starting from Soichi Kakeya's intuitive problem statement, to the discovery of Besicovitch sets, and the high-dimensional Kakeya conjecture in modern mathematics (harmonic analysis and partial differential equations).

Featured image of post From Mercator to Equal Earth: The History of Map Projections and Human Spatial Cognition

From Mercator to Equal Earth: The History of Map Projections and Human Spatial Cognition

Looking back at the evolutionary history of map projections, we explore deeply how humanity has perceived and represented the Earth's space, from the Mercator projection to the latest Equal Earth projection.