Site of the dayOur project24zdorovie.commixWorldwide
24zdorovie: health without myths
A bilingual health site with source-cited explainers and 25 calculators and self-tests that run right in your browser.
Educational Websites
Educational websites work best when you learn by doing, not by reading walls of text. This collection gathers interactive ones: each was picked by an editor, opened and checked live, and given a short review explaining what you'll learn and how.
Flexbox Froggy has you guide frogs onto lily pads by writing CSS, and before you know it, layout makes sense. Seeing Theory from Brown University lets you flip coins and drop balls to watch the rules of probability emerge before you ever see a formula. Bartosz Ciechanowski writes long, hands-on explainers on watches, bikes, GPS and sound, where every diagram is a 3D model you can spin and tweak. Learning Synths by Ableton teaches envelopes, oscillators and filters by ear, and Seeing Speech shows MRI and ultrasound footage of the tongue and lips as each sound of the phonetic alphabet is made.
These learning sites suit curious adults, students, and teachers looking for something to show a class. The list keeps growing as new finds are added regularly.
Selected:
12 finds
Site of the dayOur project
Site of the daytatoeba.orgmixWorldwide
Tatoeba: sentences in every language
An open, volunteer-built collection of sentences and their translations: millions of examples in hundreds of languages, many recorded by native speakers. Free and weirdly addictive.
Site of the dayredblobgames.comenWorldwide
Red Blob Games: algorithms you can poke at
Red Blob Games explains algorithms through game examples — A* pathfinding, hex grids, map generation from noise — with interactive diagrams you can drag and tweak.
Site of the dayseeingspeech.ac.ukenWorldwide
Seeing Speech: watch speech from the inside
An interactive International Phonetic Alphabet chart: click a symbol to hear the sound and watch MRI and ultrasound footage of the tongue and lips as it's made.
Site of the daycamerasim.comenWorldwide
CameraSim: practice photography, no camera
CameraSim offers free in-browser camera simulators: change shutter speed, aperture and ISO and instantly see the result. There's a 3D version for practicing full manual mode.
Site of the dayseeing-theory.brown.eduenWorldwide
Seeing Theory: statistics you can see
A visual introduction to probability and statistics from Brown University: flip coins, drop balls and watch the rules emerge before you ever see a formula. Available in English, Chinese and Spanish.
Site of the daylearningsynths.ableton.comenWorldwide
Learning Synths by Ableton: learn by playing
Ableton's free interactive course: drag inside a box and a synth plays, then chapter by chapter you learn envelopes, LFOs, oscillators and filters by ear.
Site of the dayOur projectcalclumen.comenWorldwide
CalcLumen: Everyday Calculators
124 free calculators and converters for mortgages, interest, home projects, health and dates. No signup, and every tool comes with a plain-English explainer and FAQ.
Site of the dayncase.meenWorldwide
Nicky Case's playables
Playable explanations of big ideas — game theory and trust, anxiety, news cycles, AI safety. All free and released into the public domain.
Site of the dayciechanow.skienWorldwide
Bartosz Ciechanowski
Long, hands-on explainers on how watches, bikes, GPS, sound and the Moon work — every diagram is a 3D model you can spin and tweak with sliders.
Site of the dayflexboxfroggy.commixWorldwide
Flexbox Froggy: frogs teach CSS
A game where you guide frogs onto lily pads by writing CSS flexbox properties. Before you know it, layout makes sense.
Site of the dayhtwins.net/scale2mixWorldwide
The Scale of the Universe 2
One slider takes you from the tiniest particles all the way out to the size of the observable universe. Click anything along the way to read about it.