Can You Pass This Difficult Knowledge Test?

Only strawberries have seeds on the outside. These seeds are the fruit's ovaries, called "achenes."

Believe it or not, one-quarter of your total bones are in your feet. Talk about a complex part of your anatomy!

A bathyscaphe is a type of submersible vessel. It's the vessel that deep-sea explorer Auguste Piccard used.

Vatican City is the smallest country in the world. It measures only 0.2 square miles - smaller than Manhattan.

A person is acclimatized when they have adjusted to the temperature, altitude and other conditions in a location. Another word for this is acclimated.

The Eustachian tube is found in the middle portion of the ear. The tube is about 35 mm long in adult humans.

All insects have six legs. They also, for the most part, have four wings.

Honey is one of the only foods that never spoils. You could eat the ancient honey of our ancestors.

Niagara Falls is constantly moving backward, due to erosion from the force of the water. It once eroded more than 3 feet per year, but with water diversion for hydro-electricity the falls now erode less than one foot per year.

An endocrinologist is a doctor that specializes in hormones. If you're suspecting low-T, he or she is the doctor to see.

Portland, Oregon, is further west than Los Angeles. Reno, Nevada, is also slightly more to the west.

Paris is actually north of the state of Maine. So is all of Great Britain.

Dr. Yoshiro Nakamatsu has invented over 3,500 things in our modern world. He is fighting cancer with many strategies, including singing to trigger cancer immunity in the brain.

Lettuce is the only produce that is never frozen, canned, or preserved in any way. Just think of how gross canned lettuce would be!

The hyoid bone is located in the neck. It's the only bone not attached to another bone.

20°C translates into 68°F. This is the lower limit for what is defined as room temperature.

Both asparagus and rhubarb can reproduce on their own. Many other vegetables must be replanted each year.

There are a total of 31,536,000 seconds in each year, not counting leap years. That's 60x60x24x365! Let's make them all count, you genius you.

Boxing is one sport where no one knows what the score is until the competition is done. No one knows who the technical leader is, either.

The pilomotor reflex refers to the phenomenon of goosebumps raising on your skin. This can happen due to temperature​ or emotions.

The sperm whale is loudest, based on decibel levels. However, it's complicated, given questions of frequency and duration, plus sound in air vs. sound in water. Other candidates for the loudest include the sperm whale, pistol shrimp and bulldog bat.

There are 14 punctuation marks in English grammar. They are the period, comma, colon, semicolon, dash, hyphen, apostrophe, question mark, exclamation point, quotation marks, brackets, parentheses, braces, and ellipses. And then there's the interrobang.

When you add up all those numbers consecutively, you come to 5,050. Go ahead and try it on a calculator.

Florida is the southernmost state in the continental U.S. Miami is the southernmost major metropolis. Hawaii, which is a state but not part of the continental U.S., is further south.

Lewis Carroll, the author of "Alice's Adventures in Wonderland," was also its original illustrator. Carroll was a mathematician at the time.

About ten percent of humans are left-handed. Is it a myth that left-handed people are smarter? Don't ask a left-handed person.

The Milky Way Galaxy is disk-shaped. There's a rod at the center of it, and then a series of arms spiraling around it.

Astronomers estimate that there are 100 to 400 bbillion stars in the Milky Way alone. There are then countless other galaxies.

Benjamin Harrison was the 23rd president of the United States. He was president from 1889 to 1893.

Alexander Graham Bell invented many things. These include a metal detector, hydrofoil and audiometer.

The general consensus is that Shakespeare wrote 37 plays. That being said, there are theories that he didn't write them all.

There are only 13 letters in the Hawaiian alphabet - five vowels and eight consonants. Communication is simple and easy when you're living the spirit of Aloha.

Scientists estimate that there are 37.2 trillion cells in the human body. This will vary from person to person, of course.

From Earth, it's possible to see as much as 59% of the moon's surface. It's thanks to slight lunar wobbling that we're able to see so much of it.

In the sleeping state, you burn more calories than while you're awake and watching television. Go to bed earlier!