Life & living things
The largest organ on the human body, protecting us from microbes and regulating temperature.
The skin
This is the boiling point of pure water in degrees Celsius.
100°C
Because of its iron-rich, rusty soil, this planet in our solar system is nicknamed the "Red Planet."
Mars
We see a flash of lightning in the sky before we hear the crash of thunder because of this rule of physics.
Light travels faster than sound
Water is made of Hydrogen (which explodes) and Oxygen (which helps fire burn), yet water does not catch fire for this reason.
It is already reacted Hydrogen that has burned
This is the only mammal capable of true, sustained flight.
A bat
This is the only metal that remains a liquid at room temperature.
Mercury
It takes about this many minutes for light leaving the surface of the Sun to actually reach Earth.
8 Minutes
This invisible force slows down a skydiver after they open their parachute.
Air Resistance (Drag)
Bananas are slightly radioactive because they contain high amounts of this essential element.
Potassium
Sharks don't have a single bone in their bodies. Instead, their skeletons are made entirely of this flexible material, which is also found in your nose and ears.
Cartilage
Sparkling diamonds and the dark graphite inside your school pencils are made of the exact same chemical element. Name this element.
Carbon
Double points: If you travel to the Moon, your weight changes because of weaker gravity, but this measurement of how much "stuff" you are made of stays exactly the same.
Mass
If you threw a heavy bowling ball and a light feather off a cliff on the Moon (which has no air), this one would hit the ground first.
They will hit at the same time
This is the only letter of the alphabet that does not appear anywhere on the Periodic Table of Elements.
The letter J
This deep-sea creature has three hearts, nine brains, and blue blood.
an Octopus
This is the scientific term for when a solid (like dry ice) turns directly into a gas without melting into a liquid first.
Sublimation
Even though Mercury is closest to the Sun, this planet is actually the hottest in our solar system due to its thick, heat-trapping atmosphere.
Venus
Sound waves cannot travel through the vacuum of outer space for this specific reason.
There are no particles to vibrate and pass the energy along
Unlike most liquids, water does this unique thing when it freezes, which luckily stops lakes from freezing solid from the bottom up and killing fish.
It expands and floats
This microscopic creature, also known as a "water bear," is considered the toughest animal on Earth, capable of surviving the frozen vacuum of outer space.
Lightning bolts and the glowing cores of stars are not solids, liquids, or gases. They are made of this super-heated fourth state of matter.
Plasma
If you could magically tunnel all the way to the exact geometric center of the Earth, how much you would weigh?
0 / Nothing (because the Earth's mass would pull you equally in all directions)
A metal spoon feels much colder to the touch than a wooden spoon sitting in the same room because the metal spoon is doing this to your hand.
Conducting (stealing) away from your hand faster
If you put a cup of hot water and a cup of cold water into a freezer at the same time, this one will usually freeze faster.
The hot water (known as the Mpemba Effect)