Science & Nature
This gas makes up about 78% of Earth's atmosphere
Nitrogen
This is the only even prime number
2
This is the name of the first artificial satellite launched into space
Sputnik 1
This fundamental force keeps us grounded on Earth
Gravity
This chemical element has the symbol "O" and is essential for breathing
Oxygen
This is the only planet in our solar system that rotates on its side
Uranus
The sum of all angles in a triangle always equals this many degrees
180
This simple machine consists of a wheel with a rope wrapped around it to lift heavy objects
Pulley
This famous equation, written by Einstein, describes the relationship between energy and mass
E = mc²
This metal is liquid at room temperature, commonly found in thermometers
Mercury
The hardest naturally occurring substance on Earth
Diamond
The Fibonacci sequence starts with 0 and 1. This is the 6th number in the sequence
5
This technology uses reflected sound waves to detect objects underwater
Sonar
The speed of light in a vacuum is approximately this many kilometers per second
300,000 km/s
This is the only letter that does not appear in any element’s symbol on the periodic table
J
These tiny structures inside cells produce energy, leading some to call them "the powerhouse of the cell"
Mitochondria
If a pizza is cut into 8 equal slices and you eat 3, this is the fraction of pizza remaining
5/8
The "Turing Test" was created to determine if a machine has this ability
Artificial intelligence
If you were on the Moon, you would weigh about this fraction of your Earth weight
1/6
The pH scale measures this property of a substance
Acidity or alkalinity
The rarest naturally occurring element on Earth, with less than 30 grams estimated to exist in the planet’s crust
Francium
In binary, the number 1010 represents this number in decimal
10
Invented in 1947, this semiconductor device revolutionized electronics and replaced vacuum tubes
Transistor
This type of matter, which makes up most of the universe, cannot be directly observed but is inferred through gravitational effects
Dark matter
This law states that the pressure of a gas is inversely proportional to its volume at constant temperature
Boyle’s Law