Creepy Critters
If you chopped off this creature's head, it would keep walking around for weeks before eventually starving to death, because it breathes through tiny holes in its sides.
What is a cockroach?
When you mix baking soda and vinegar, this invisible gas rushes out, which is the exact same stuff your body makes and breathes out when you exhale.
What is carbon dioxide?
Humans are born with about 270 soft, squishy bones, but as adults, we only have this many fused and hardened bones.
What is 206?
Rubbing a balloon on your hair steals electrons and builds up this invisible force, making your hair stand straight up like you just saw a ghost.
What is static electricity?
This creature has three hearts, blue blood, and a brain shaped like a donut with its esophagus running right through the middle.
What is an octopus?
This tiny vampire of the insect world injects a chemical that numbs your skin so you won't feel it drinking your blood until it's as fat as a blueberry.
What is a mosquito?
This eerie frozen solid skips the liquid phase entirely as it warms up, turning straight into a bubbling, fog-spewing gas.
What is dry ice?
This is the longest, hardest, and heaviest bone in your body, located right in your upper leg.
What is the femur?
When sound waves bounce off a spooky canyon wall or empty cave and return to your ears, they create this acoustic illusion.
What is an echo?
If you cut off the arm of this spiky sea creature, not only does the arm grow back, but a whole new creature can grow from just that severed piece.
What is a starfish (or sea star)?
These eight-legged apartment-dwellers have blue blood, eight eyes, and silk that is pound-for-pound stronger than steel.
What is a spider?
Glowing tonic water looks normal in daylight, but under a blacklight, it glows an electric blue thanks to this chemical extracted from tree bark.
What is quinine?
Unlike human bones that are heavy and filled with jelly-like marrow, bird bones are structured like this to stay lightweight for flight.
What is hollow (or honeycomb-shaped)?
A total solar eclipse turns midday into eerie twilight because the Moon steps directly in front of this blazing giant.
What is the Sun?
This immortal little jellyfish can theoretically live forever by hitting the biological 'reverse' button and turning back into a baby polyp when it gets stressed or old.
What is the immortal jellyfish (Turritopsis dohrnii)?
This ocean predator has teeth that constantly conveyor-belt forward, meaning it goes through up to 30,000 teeth in a lifetime.
What is a shark?
This chemical process happens when iron meets oxygen and water, slowly turning a shiny metal bike or fence into a reddish-orange crust of doom.
What is oxidation (or rust)?
Shark skeletons are a total fraud—they don't have a single hard bone in their bodies, because their skeletons are made entirely of this rubbery stuff.
What is cartilage?
This spooky wave phenomenon happens when light or sound waves bend around corners or squeeze through tight gaps.
What is diffraction?
This bizarre mammal lays eggs, glows green under ultraviolet light, and sweats milk for its babies instead of having nipples.
What is a platypus?
Some species of this slimy garden visitor can sleep for up to three years straight if the weather gets too dry or spooky.
What is a snail?
Deep-sea creatures make their own spooky neon green or blue light down in the pitch-black ocean using this biological chemical reaction.
What is bioluminescence?
These microscopic cellular demolition workers in your body constantly dissolve old bone tissue so other cells can rebuild it.
What are osteoclasts?
Lightning can heat the air around it to 50,000 degrees Fahrenheit, which is five times hotter than the surface of this star.
What is the Sun?
This forest fungus network is sometimes called the "humongous fungus" and spans over 2,000 acres underground, making it one of the largest living organisms on Earth.
What is a mushroom (honey fungus / Armillaria)?