• Anyone here have flu?

  The odds that someone in a room of N people in California is contagious with flu this week, from CDC surveillance data. Guess first.

  matmat202.github.io/anyone-here-have-flu→

• Crypto Lifetimes: when every cipher, hash and protocol was born, cracked and retired

  29 ciphers, hashes, key exchanges and protocols from 1976 to today: when each was published, first weakened, practically broken and retired, every date quoted from its source.

  matmat202.github.io/crypto-lifetimes→

• Daylight · sunrise, sunset and day length for any town

  Sunrise, sunset and day length for any town of 15,000+ people, on any day, in the town

  matmat202.github.io/daylight→

• For the Date · is today warm or cold for the date where you are?

  Is today warm or cold, wet or dry, for the date? The forecast for any town of 15,000+ people, against the same days of the calendar in each of the 30 years 1991-2020.

  matmat202.github.io/for-the-date→

• Free classrooms · Stanford

  Which Stanford lecture rooms are empty right now and for how long, from the class schedule. Built for phones.

  matmat202.github.io/free-rooms→

• Further North · which city is further north?

  Two world cities: which one is further north? Ten a day, from easy to a hair

  matmat202.github.io/further-north→

• How Far? · the distance, direction and time difference between any two towns

  How far apart are two towns? The distance as the crow flies, which way to set off, the halfway point, the time difference and a rough flight time, with the route on a world map.

  matmat202.github.io/how-far→

• In session · Stanford

  What class is meeting in every Stanford room right now — the course, who teaches it, and when it ends. Search a room, a building, a course or an instructor.

  matmat202.github.io/room-now→

• Is the Bay's summer fog disappearing?

  Every summer day at SFO and Oakland since 1948, read from NOAA

  matmat202.github.io/fog-decades→

• Kin of the Day · one species, and when you last shared an ancestor

  Every day one species from across the tree of life, drawn as its branch back to the ancestor it shares with you, dated by TimeTree.

  matmat202.github.io/kin-of-the-day→

• Name Years · every US first name, every year since 1880

  Type a first name and see how many US babies were given it every year since 1880, when it peaked, its rank today, when half of everyone with it was born, and how old the ones alive now are. From Social Security records.

  matmat202.github.io/name-years→

• Paper of the Year · Stanford's most-cited paper, every year since 1900

  Stanford

  matmat202.github.io/paper-of-the-year→

• Same Until the Lamp

  Two colours that match in daylight and come apart under a warm bulb. A new pair every day.

  matmat202.github.io/same-until-the-lamp→

• Shaken · the world's earthquakes, and the biggest near you

  Every magnitude 2.5+ earthquake in the past day, week or month, live from USGS, on a world map. Type your town to see the biggest ones near you.

  matmat202.github.io/shaken→

• Stanford Daily Ngrams · 134 years of the campus paper

  Type a word and see how often The Stanford Daily printed it, every five years from 1892 to today: 695,000 digitised articles, then the paper’s web site.

  matmat202.github.io/daily-ngrams→

• Stanford Dining Menus

  Every Stanford dining hall menu, with hours, distance and allergen filters. Built for phones.

  matmat202.github.io/stanford-dining-menus→

• Stanford on GitHub · every repo from Stanford labs, courses and clubs

  Every public GitHub repo from Stanford

  matmat202.github.io/stanford-on-github→

• Stanford Outlines · name the building

  Ten Stanford buildings a day, drawn as their real OpenStreetMap footprints. Name each one from its outline.

  matmat202.github.io/stanford-outlines→

• Stanford Roots · where Stanford's people were born

  A world map of where 5,000+ Stanford-educated people, and 1,700+ who worked there, were born, from Wikidata. Pick a country, or type your hometown, and meet everyone from it.

  matmat202.github.io/stanford-roots→

• Stanford Theatre archive · every film since 1997

  Every film the Stanford Theatre in Palo Alto has shown since 1997, from its own program pages: search a title to see every year it played, what

  matmat202.github.io/stanford-theatre→

• Still Unnamed · the human genes known only by a placeholder

  How many human protein-coding genes were known only by a placeholder symbol (C1orf, FAM, KIAA) each year since 1986, rebuilt from the HGNC gene-name database and checked against HGNC

  matmat202.github.io/still-unnamed→

• Tide Table

  The next high and low tide at any of NOAA

  matmat202.github.io/tide-table→

• When does the Dish turn green?

  26 years of satellite pictures of the Stanford Dish hills, gold to green, against the first soaking rain of each season.

  matmat202.github.io/dish-greens→

• When Works? · the hours when everyone is awake, across time zones

  Pick a few towns anywhere and a day: see the hours when everyone is at work or at least awake, hour by hour in each town

  matmat202.github.io/when-works→

• Where Did I Park

  Infers where you parked from your speed and position, and points you back. Nothing leaves your phone.

  matmat202.github.io/where-did-i-park→

• Which Came First? · a daily ten from history

  Two famous things, one question: which came first? The telephone or photography? Titanic or the Higgs boson? Ten a day, from centuries apart to a year.

  matmat202.github.io/which-first→

• Which Country? · a daily ten from Our World in Data

  Two countries, one number: who lives longer, who is richer, who emits more? Ten a day from Our World in Data, from worlds apart to neck and neck.

  matmat202.github.io/which-country→

• Which Read More? · a daily ten from yesterday's Wikipedia

  Two Wikipedia articles from yesterday

  matmat202.github.io/which-read-more→

• Which Way Next? · higher or lower a year later?

  Ten years of a US economic number, up to a month in the past: was it higher or lower a year later? Ten a day from FRED, from landslides to near-flat years.

  matmat202.github.io/which-way→

• Who's Off · the world's public holidays, any day

  Which countries have a public holiday today, or on any day in 2026 and 2027 — nationwide and regional — and when a country

  matmat202.github.io/whos-off→

• ¿Cuál se filtró más? · un juego diario de contraseñas

  Dos contraseñas que se usan en México: toca la que aparece más en filtraciones de datos. Diez pares al día, los mismos para todos.

  matmat202.github.io/cual-se-filtro→

• ¿Ya salió? · Todos los sorteos del Melate desde 1984

  El mismo boleto ganó el Melate dos veces, con 41 años de diferencia. Y los números calientes no sirven: lo comprobamos con los 4,286 sorteos.

  matmat202.github.io/ya-salio→