Doctor (Physician)
Diagnoses and treats illnesses. Takes many years of school, but you help people every day.
Curio.
Search any subject. Every answer comes from a real, linked source.
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Explore 219 built-in articles across 13 subjects, including the 1980s and 1990s. Search also looks beyond the library on Wikipedia.
✦ Fun fact
Honey found in ancient Egyptian tombs was still edible after about 3,000 years.
Source: Smithsonian MagazineExplore careers
Thinking about your future? Read about real jobs — every card links to a full article.
Software Engineer
Builds apps, games and websites by writing code. One of the fastest-growing jobs in the world.
Astronaut
Travels to space and runs science experiments aboard spacecraft and space stations.
Veterinarian
A doctor for animals — from pets to farm animals to zoo wildlife.
Physicist
Researches matter, energy, gravity, and the fundamental physical laws governing the universe.
Teacher
Helps students learn new skills and ideas, from kindergarten to university.
Historian
Investigates past civilizations, primary documents, and cultural transformations.
Architect
Designs buildings, bridges and whole neighborhoods, mixing art with engineering.
Pilot
Flies airplanes carrying people or cargo all around the world.
Marine Biologist
Studies ocean life, from tiny plankton to giant whales, often working at sea.
Journalist
Finds and reports true stories for newspapers, TV, radio and the web.
Electrician
Installs and repairs the wiring that powers homes, schools and cities.
Nurse
Cares for patients in hospitals and clinics — the heart of healthcare.
Game Designer
Creates the worlds, rules and stories inside video games.
Chef
Leads a kitchen, creates dishes and runs restaurants, bakeries and more.
Forensic Scientist
Uses science like DNA and fingerprints to help solve crimes.
Civil Engineer
Designs roads, bridges, dams and water systems that whole cities rely on.
Psychologist
Studies how the mind works and helps people with their feelings and behavior.
Black hole
A black hole is an astronomical body so compact that its gravity prevents anything, including light, from escaping. Albert Einstein’s theory of general relativity, which describes gravitation as the curvature of spacetime, predicts that any sufficiently compact mass will form a black hole. The boundary of no escape is called the event horizon. In general relativity, crossing a black hole’s event horizon traps an object inside but produces no locally detectable change. General relativity also predicts that every black hole should have a central singularity, where the curvature of spacetime is infinite.
Supermassive black hole
A supermassive black hole is the largest type of black hole, with its mass being on the order of hundreds of thousands, or millions to billions, of times the mass of the Sun. Observational evidence indicates that almost every large galaxy has a supermassive black hole at its center. For example, the Milky Way galaxy has a supermassive black hole at its center, corresponding to the radio source Sagittarius A*. Accretion of interstellar gas onto supermassive black holes is the process responsible for powering active galactic nuclei and quasars.
Black Holes and Revelations
Black Holes and Revelations is the fourth studio album by the English rock band Muse. It was released on 3 July 2006 through Warner Bros. Records and Helium-3. It was produced by Rich Costey over four months in London, Milan, New York City, and southern France.
List of most massive black holes
This is an ordered list of the most massive black holes so far discovered, measured in units of solar masses.