1960s New Haven Pedometer Review/HowTo

Hoodlum 1997 movie (Math Props)

Pascal's 1630 Machine: The First Calculator! Pascaline Review / HowTo

Nine Nielsen Theories! Fixed point, coincidence, etc etc!

Trade Stimulator Review / HowTo

Slide Rule Chopsticks Review / HowTo

Parent's Guide To Chisanbop full audio recording

The Rise and Fall of Chisanbop

ROONS! A new marble computer

I made a new kind of slide rule: Helical 3D-printable slide rule

Otis King 1920s calculator

The Mile-O-Matic! feat. Stephen Freeborn

At-most-n-valued maps (slightly more technical version)

At-most-n-valued maps

The Multi-Divi: Swedish multiplier from 1911

Ahead of the count: Probabilistic predictions of IRV elections. JMM 2025

It finds the derivative: The Ott Derivimeter (1930s)

Ranked Choice Voting for lovers, haters, and prognosticators

The Sector: the calculator of the 1500s

Pocket Sundial Retorts!

The Sunwatch! 1920s pocket sundial

Binary number system from 1617 (Napier's Location Numerals) Review / HowTo

1984 (Math Props)

Corona City! Groton NY and the Corona Club

1600s binary multiplier (Napier's Location Arithmetic) Review / HowTo

The configuration space of at-most n points on the circle

Terminator: The Sarah Connor Chronicles (Math Props)

The most unnecessary election recount ever

3D Printable 1:1 scale SOLID CURTA

Thoughts on configurations of at most n points

A higher homotopy group for digital images

The Curta Calculator (full documentary) Review / How To

Finale: Why the Curta? 12 Days of Curtsmas 12

Curta Mailbag! 12 Days of Curtsmas 11

Curta Variations & Marketing. 12 Days of Curtsmas 10

Square roots on the Curta. 12 Days of Curtsmas 9

Rallying with the Curta. 12 Days of Curtsmas 8

Math Props: the Curta Calculator in Gibson's Pattern Recognition

Division on the Curta. 12 Days of Curtsmas 7

Curt Herzstark's story. 12 Days of Curtsmas 5

Design of the Curta. 12 Days of Curtsmas 4

The Stepped Drum Mechanism. 12 Days of Curtsmas 3

Multiplication on the Curta. 12 Days of Curtsmas 2

Addition and subtraction on the Curta. 12 Days of Curtsmas 1

The second homotopy group of the sphere: π₂(S²) in classical and digital topology

Curtsmas mailbag! Please send your Curtsmas wishes.

12 Days of Curtsmas trailer! Coming in December

National Cash Register 1925 & 1953 Review / HowTo

Tempscribe winding thermometer Review / HowTo

Son of the MK Area Calculator

1920s Radial Planimeter Review / HowTo

Writing a math research paper: start to finish!

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1840s "Universal Calculator" Review / HowTo Lalanne's Abaque

Numberaid the American Abacus! Review / HowTo

L.A. Noire (Math Props)

The Prisoner: Arrival (Math Props)

W10 Wind Speed Indicator Review / HowTo

Bob Brown's n-valued Nielsen theory, and a bit more

ACU-ARC Ruler Review / HowTo