guess the country by its silhouette. daily challenges, gets surprisingly tricky ( turns out i'm terrible at it )

geography quizzes for countries, capitals, flags, and more

drop into a random streetview location anywhere on earth and guess where you are. free daily challenges available — unlimited play requires a subscription

drag any country over the map and see its real size compared to others

free courses on basically everything

youtube channel explaining complex science topics with beautiful animation and tons of adorable birds

space news, images, articles, and research. the astronomy picture of the day is worth checking regularly

photograph any plant or animal and get it identified. user discretion advised though, don't go eating plants you can't confidently ID!

a guide to the world's weird, wonderful, and hidden places. history, folklore, and oddities

virtual tours of hundreds of museums, hi-res artwork, and cultural deep dives. you can zoom in on paintings!

history, science, nature, and culture articles, free to read online

the entire metropolitan museum of art collection online. 500,000+ works, all browsable and free to download

70,000+ free ebooks of classic literature, a little confusing to try and navigate initially

gutenberg books but beautifully typeset and properly formatted

free public domain audiobooks

massive archive of poems from every era

free interactive music theory lessons and exercises

music theory exercises and ear training

entire collection online great for desktop wallpapers too.

completely free audio courses for spanish, french, greek, german, italian, arabic, turkish and more

pronunciation dictionary in every language, spoken by native speakers. incredibly useful when you read a word and have no idea how to say it.

vocabulary building through fill-in-the-blank sentences. good for intermediate learners who've outgrown duolingo.

quizzes on literally everything. countries, movies, history, science, music

improve your typing speed by racing others using quotes from books, movies, and songs

computational knowledge engine. ask it anything mathematical, scientific, or factual

actual MIT course materials, free online

learn html, css, javascript, python, and more. 100% free, nonprofit

the library of the internet. books, music, software, websites, tv, movies. also where old geocities sites can still be found

famous philosophical works summarized in plain, conversational language

free academic-quality philosophy lectures on youtube. covers logic, ethics, epistemology, metaphysics. made by actual philosophy professors

podcast and articles

cornell lab of ornithology's free bird guide. identification, calls, behavior, range maps. basically an encyclopedia for every bird species you can think of

free app by cornell lab that identifies birds by sound in real time. hold your phone up outside and it tells you what's singing in your yard!

science journalism, free to read online

a massive free library of mythology, folklore, religious texts, and occult writings from every culture on earth. norse eddas, egyptian book of the dead, celtic myths, grimoires

free reference site covering myths, gods, creatures, and stories from greek, norse, egyptian, celtic, and other traditions

math visualizations on youtube

free online graphing calculator that's surprisingly fun to mess around with. type in any equation and watch it draw itself. great for visual thinkers

one professor (rod nave, georgia state university) built an entire physics encyclopedia as a hypertext concept map. copyright 2001. still up and cited in university courses worldwide. looks like crap and thats what makes it charming

since 1996, one person has been compiling word lists and language resources to spread the joy of the english language in all its variety. 17,000+ obscure words, lost words, rare vocabulary that probably doesn't get used anymore

douglas harper built a complete etymology dictionary of the english language by himself in 2001 and has maintained it alone ever since. look up where any word came from

one professor (paul dawkins, lamar university) typed out his entire calculus, algebra, and differential equations curriculum by hand in html

"fighting ignorance since 1973." one person (cecil adams) spent decades answering the weird questions nobody else would. new columns stopped in 2018 but the archive is enormous, deep, and absolutely worth reading

john walker, one of the founders of autodesk, runs this personal science site from switzerland. astronomical tools, a random number generator powered by actual radioactive decay, an earth viewer, weird essays.

the original hacker culture dictionary. first compiled in the 1970s

describe a concept and it finds the word for it. great for words you just can't seem to find