stackyFACTS
Science

Your belly button is the scar you never outgrow

HERE’S THE INTERESTING PART

Your navel is just a permanent reminder of your original plumbing. After your umbilical cord withered and fell off, the surrounding abdominal muscles closed up, leaving you with a completely useless, highly susceptible lint-trap of a scar.

Your belly button is the scar you never outgrow
STACKY / Science
One discovery leads to another.

Keep exploring facts in this topic.

Science →
STACKY FOR IPHONE

A bigger world.
One discovery
at a time.

Keep discovering with Stacky. Interesting facts in an app that is always within reach.

Download on the App Store
ONE MORE DISCOVERY?

Keep exploring

All in this topic →
Why your heart ends up on the left
Science

Why your heart ends up on the left

The only reason your heart is on the left side of your chest is because of millions of microscopic, spinning biological windshield wipers. During early…

Discover more
Penguins drink seawater and sneeze out the salt
Science

Penguins drink seawater and sneeze out the salt

Drinking exclusively from the ocean should immediately kill you via intense cellular dehydration, unless you wear a tuxedo. Penguins bypass this minor…

Discover more
If the blood rushing through your healthy body is always red, why do the veins in your wrist look distinctly blue?
Science

If the blood rushing through your healthy body is always red, why do the veins in your wrist look distinctly blue?

If the blood rushing through your healthy body is always red, why do the veins in your wrist look distinctly blue?

Discover more
Earthworms have five pairs of hearts
Science

Earthworms have five pairs of hearts

It takes an extraordinary amount of cardiovascular effort to blindly tunnel through dirt all day. Earthworms have five pairs of aortic arches tucked closely…

Discover more
Frogs do not possess a hard palate separating their mouth from their eye sockets, so when they swallow a particularly large insect, they literally retract their eyeballs deep…
Science

Frogs do not possess a hard palate separating their mouth from their eye sockets, so when they swallow a particularly large insect, they literally retract their eyeballs deep…

Frogs do not possess a hard palate separating their mouth from their eye sockets, so when they swallow a particularly large insect, they literally retract…

Discover more
Why does stubbing your toe predictably generate a second, deeply agonizing wave of pain a few seconds after the initial impact?
Science

Why does stubbing your toe predictably generate a second, deeply agonizing wave of pain a few seconds after the initial impact?

Why does stubbing your toe predictably generate a second, deeply agonizing wave of pain a few seconds after the initial impact?

Discover more
StackyMore discoveries in the app
Download on the App Store