404: Knowledge Not Found
Developed by Apple Inc. specifically for Macintosh computers, this operating system includes features such as Finder, Safari, and the Dock interface.
What is macOS?
To calculate this statistical value, all numbers in a data set are added together and then divided by the total quantity of numbers in that set.
What is the mean (average)?
This resistive force occurs when two surfaces rub against one another and acts opposite the direction of motion.
What is friction?
Made from cement, water, sand, and gravel, this durable construction material is commonly used in bridges, roads, sidewalks, and skyscrapers.
What is concrete?
Caused by collisions of air molecules, this force presses against surfaces in Earth’s atmosphere and is commonly measured with a barometer.
What is air pressure?
Unlike traditional money stored in banks, this type of digital currency uses encrypted online transactions and decentralized technology such as blockchain.
What is cryptocurrency?
This two-dimensional geometric figure contains four equal sides, four right angles, and diagonals that bisect each other equally.
What is a square?
In Einstein’s famous equation E = mc², energy is equal to mass multiplied by this universal constant squared, approximately 300 million meters per second.
What is the speed of light?
Commonly found in wind farms, these tall structures use rotating blades connected to generators to convert kinetic energy from moving air into electricity.
What are wind turbines?
Measured in kilograms in the metric system, this quantity describes the amount of matter contained within an object regardless of gravity.
What is mass?
This essential type of software controls a computer’s hardware and memory, allows programs to run, and acts as the interface between users and the machine.
What is an operating system?
Represented by the Greek letter π, this irrational and transcendental number is approximately equal to 3.14159 and relates a circle’s circumference to its diameter.
What is pi?
These negatively charged subatomic particles move around the nucleus of an atom and play a major role in electricity and chemical bonding.
What are electrons?
This simple machine, a modified incline plane, features spiral threads and is commonly used with drills or screwdrivers to fasten materials together securely.
What is a screw?
Occurring naturally in stars like the Sun, this nuclear reaction combines smaller atomic nuclei into larger ones while releasing enormous amounts of energy.
What is nuclear fusion?
Founded by Larry Page and Sergey Brin, this American technology company created the Chrome web browser and also owns YouTube and Android.
What is Google?
In geometry, this measurement represents the total distance around a shape and is found by adding all side lengths together.
What is perimeter?
Unlike speed, this measurement includes both how fast an object moves and the direction in which it travels.
What is velocity?
These kitchen appliances preserve food by removing heat from an insulated compartment using compressors and refrigerants in a heat pump system.
What are refrigerators?
Measured in Tesla units, these invisible vector fields surround magnets and electric currents and show both the direction and strength of magnetism.
What are magnetic fields?
These advanced electronic devices can solve complex mathematical problems involving trigonometry, logarithms, and exponents beyond simple arithmetic.
What are scientific calculators?
This branch of mathematics studies points, lines, angles, shapes, dimensions, and the relationships between objects in space.
What is geometry?
These massless quantum particles travel at the speed of light and are responsible for electromagnetic radiation visible to the human eye.
What are photons?
Designed to support heavy vertical loads while spanning rivers, roads, or valleys, these large structures are important parts of transportation infrastructure.
What are bridges?
Headquartered near Geneva on the French-Swiss border, this European research organization operates the world’s largest particle accelerator, the Large Hadron Collider.
What is CERN?