Education
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Oliver Heaviside and the Theory of Transmission Lines
A clear technical note on how Heaviside reshaped electrical signaling theory, explaining waves, impedance and distortion…
Olivier Cleynen
Olivier Cleynen's free lecture notes and books on fluid mechanics and thermodynamics, with clear illustrations, along wi…
Ologies with Alie Ward
The episode archive of Ologies, a free comedy-science podcast in which Alie Ward asks experts in obscure fields, from ba…
omen.ops
Five hundred years of Joseon court omens, from comets to earthquakes, presented as a mock observability dashboard with a…
OmnesViae
A Roman route planner built on the Tabula Peutingeriana and the Antonine Itinerary, mapping ancient cities and roads so…
Omni Calculator
A collection of more than 3,000 free calculators built with subject experts, covering everything from mortgage payments…
Omniatlas
An interactive atlas of world history with step-by-step political maps of every era and region, each annotated with the…
Omniglot
Simon Ager's online encyclopedia of writing systems and languages, documenting scripts and alphabets from around the wor…
On Beauty and the Death of African American Literature
An essay on Zadie Smith's novel On Beauty that asks whether African American literature is dying, examining Black petit…
On Biology
BMC's blog of insight and opinion on the latest biology research and developments, with short pieces that translate new…
On Finishing Finnegans Wake
Gabrielle Carey reflects on the many years it took her reading group to finish Finnegans Wake, and what Joyce's impossib…
On History
A digital magazine from the Institute of Historical Research, the UK national centre for the study of history, publishin…
On the Economy (St. Louis Fed)
The Federal Reserve Bank of St. Louis's blog translating economic research on inflation, jobs, and interest rates into p…
On the foolishness of "natural language programming"
Edsger Dijkstra's famous 1978 note arguing that formal notation exists for good reason, still much quoted in today's deb…
One in a Hundred
Shrinks the world to 100 people to show where your household income ranks, how $1,000 would be split among them, and how…
One Second Code
A guessing game where you estimate how big a number must get before a short program takes one second to run, testing you…
OneLook
A dictionary metasearch that queries dozens of dictionaries at once and includes a powerful reverse dictionary and thesa…
OneZoom
An interactive fractal tree of life letting you zoom through the evolutionary relationships of more than two million liv…
Online Conversion
A reference for converting just about anything to anything else, with thousands of units, millions of conversions, and c…
Online Cube
A free 3D Rubik's Cube in the browser with a simulator, a one-click solver that answers in about 20 moves, a speedcube t…
Online Ethics Center
A repository of case studies, articles, and teaching resources on ethics in engineering, science, and research for a gen…
Online Etymology Dictionary
A searchable dictionary that traces the origins and historical development of English words.
Online Experiment on Dogmatic Thinking
A web experiment adapted from a 2020 study that tests a cognitive quirk linked to dogmatic worldviews, with a write-up o…
Online Journalism Blog
Comment, analysis, and links on online and data journalism, citizen reporting, podcasts, and interactive storytelling, w…
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