Science
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Practical Engineering
Grady Hillhouse's entertaining and educational videos on civil engineering and public works, explaining the structures a…
Precious Plastic
A global open-source community building plastic recycling machines and sharing free blueprints, guides and workspace mod…
Predicting the Past
Try Ithaca and Aeneas, AI models that help historians restore missing letters in damaged ancient Greek and Latin inscrip…
Prehistoric Wildlife
A hobbyist-built encyclopedia profiling thousands of prehistoric animals beyond dinosaurs, with illustrations, size comp…
Prejudice-free
An interactive visualization that explores how opinions on social topics correlate with demographics, letting you see wh…
Preposterous Universe
Caltech physicist Sean Carroll's blog on physics, cosmology, philosophy and the nature of reality, alongside links to hi…
Prime Grid
A prime number grid visualizer that lays integers out in a grid so the patterns of primes and composites show up at a gl…
Prime Knots Wall Poster
A knot theory poster for math teachers plus the algorithm that generates its SVG knot diagrams, with lots of pretty tang…
primitivetechnology.wordpress.com
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Primitive Technology
The blog behind the Primitive Technology videos, where a man in the Australian bush builds huts, kilns, tools and even s…
Principia Cybernetica Web
A vintage hypertext encyclopedia tackling big philosophical questions with cybernetics, systems theory and evolution, wi…
Priyom.org
A catalogue of shortwave numbers stations and military and diplomatic broadcasts, with schedules, recordings and history…
Probabilistic Tic-Tac-Toe
A tic-tac-toe variant where chance shapes every move, playable right in the page along with a discussion of how to play…
Probable Futures
Interactive maps showing how heat, drought and precipitation could change around the world at 1.5, 2 and 3 degrees of wa…
Procedural Content Generation: L-Systems
A clear walkthrough of L-systems, the rule-rewriting grammars behind procedurally generated plants and fractals, with ex…
Professor Fun Factanimal's Fun Mysterious Animal Facts
Think of a mysterious animal and Professor Fun Factanimal tries to guess it by asking questions, in an animal guessing g…
Project Euler
A collection of hundreds of challenging mathematical and computer programming problems designed to be solved with clever…
Project FeederWatch
A Cornell Lab citizen-science project where backyard birdwatchers count feeder visitors each winter to help track bird p…
Project GREAT Photo Tour
A photo tour of a family expedition that carried atomic clocks up a mountain to test general relativity, with kids, cool…
Project Hail Mary Star Map
An interactive 3D star chart recreating the navigation computer from Project Hail Mary, using accurate star positions fr…
Project Hail Mary: Right and Wrong About Astrophysics
A Northeastern University astrophysicist weighs the science of the film Project Hail Mary, including its centrifugal gra…
Project Impact
An asteroid impact simulator based on a research paper that estimates impact energy, blast radius, and effects, and lets…
Project Implicit
A Harvard research site offering the free Implicit Association Test, letting visitors explore their own unconscious asso…
Project Lovelace
A collection of science and math flavored programming problems aimed at beginners, with topics ranging from astronomy an…
Project Rattlecam
Live cameras trained on rattlesnake dens in Colorado, California and Pennsylvania, where you can watch wild snakes, meet…
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