1. Arachnophobia
   Trypophobia
2. Emetophobia
   Erythrophobia

Trypophobia is essentially the fear of small holes. While there is no proven cause for this condition, these patterns are often associated with danger or disease in nature. Clusters of holes or irregular patterns tend to cause trypophobic people to experience stronger effects, including anxiety and nausea.

1. Krill
   Plankton
2. Silverfish
   Sea urchins

These massive creatures aren’t as ferocious as they seem. Instead of using teeth, they filter their food through comb-like structures called baleen plates. In just one day, blue whales can ingest up to eight tons of krill.

1. Statistics
   Topology
2. Combinatorics
   Stoichiometry

Stoichiometry is used to calculate the reactants and products in a chemical reaction. It is also used in measurement conversions. In chemistry, this is what allows us to convert moles into grams, liters and other units of measurement.

1. Pericles
   Damocles
2. Hercules
   Ares

This story originated from the legend of Damocles, a court flatterer who mistakenly accused King Dionysius II of having an easy and blissful life. The king responded to this by inviting Damocles to sit on his throne. Damocles was excited for the lavishness and extravagance of living like a king, until he looked up to find a sword dangling over him by a single horsehair.

1. Chongqing, China
   Jakarta, Indonesia
2. Buenos Aires, Argentina
   Dubai, United Arab Emirates

This monster of a skyscraper is more than just a notable addition to the Dubai skyline. It also has one of the fastest elevators in the world. It can climb 124 floors in one minute!

1. Tajikistan
   Kyrgyzstan
2. Laos
   Mongolia

After uniting many of Northeast Asia’s nomadic tribes, Genghis Khan conquered a vast majority of the continent in the 13th century. But, he's known for more than his brutal and thunderous past. He also created one of the world's first organized postal systems.

1. William Tecumseh Sherman
   Ulysses S. Grant
2. Grover Cleveland
   Benjamin Harrison

In 1879, naturalist James Wolverton, who served under William Tecumseh Sherman in the 9th Indiana Calvary, named a giant sequoia tree after the famous Union general. At 275 feet tall, this tree weighs approximately 2.7 million pounds!

1. Vole
   Opossum
2. Marmot
   Lemming

These small animals might look a bit frightening, especially when they are found to be playing dead. But, they are helpful to humans. They like to eat dangerous pests, including Lyme disease-carrying ticks.

1. Elizabeth Blackwell
   Mary Jane Patterson
2. Catherine Brewer
   Linda Richards

Catherine Brewer wasn't the only woman in her graduating class, but she was the first to officially earn her degree. Since her name was the first to be read from an alphabetized list, she was the one to be etched into history.

1. Paris, France
   Sao Paolo, Brazil
2. Barcelona, Spain
   Milan, Italy

Antoni Gaudí has left his footprint in history as a one-of-a-kind designer and visionary. His most well-known creations incorporate colorful, mosaic designs and unique geometric shapes. Today, seven of his creations are preserved as UNESCO World Heritage sites.

1. Thomas Edison
   George Westinghouse
2. Nikola Tesla
   Werner von Siemens

Nikola Tesla worked under Thomas Edison, where he developed many of his un-patented inventions. Edison offered Tesla $50,000 to improve upon existing plans regarding DC generation, but later reneged on the deal and brushed it off as a joke when Tesla held up his end of the bargain.

1. French
   British
2. Portuguese
   Spanish

The Colony of Ceylon gained partial independence from the British Empire in 1948. It gained full independence as the Republic of Sri Lanka in 1972, and the country is often called the "Pearl of the Indian Ocean."

1. Mycenae
   Cyrene
2. Thessalia
   Macedon

Alexander The Great certainly lived up to his name throughout history. He was responsible for conquering what is now Eastern Europe, Asia and Northeastern Africa. With Aristotle as his personal tutor, he was certainly set up for success.

1. 1869-1890
   1905-1910
2. 1920-1933
   1942-1945

The 18th Amendment was added in 1920, banning the sale, consumption, production and distribution of alcoholic beverages in the United States. This led to the creation of thousands of illegal alcohol-selling venues, or speakeasies, that were spread across the country.

1. 1,000
   10,000
2. 100,000
   1,000,000

It only takes 150 signatures for your petition to be searchable on the official We the People website. But, in order to be eligible to receive a response for a submitted petition, organizers much obtain at least 100,000 signatures within the first 30 days.

1. Parliamentary republic
   Communist
2. Unitary state
   Presidential system

The Republic of India gained independence within the British Commonwealth in 1947. In 1950, India unveiled a new constitution that outlined it as democratic country. Now, it is the largest democracy in the entire world.

1. It’s a mating ritual.
   Holding hands is a symbol of possessiveness.
2. This is how otters express comfort and trust.
   It keeps them from drifting apart while they sleep.

Sea otters will often hold hands with each other, particularly their offspring, to prevent them from being separated by ocean currents. They'll also use the same mechanism to anchor themselves to kelp, which keeps them from drifting into open ocean.

1. Making eye contact with a government official was a criminal offense.
   Only single males had permission to leave the country alone.
2. Bartenders who served watered-down beer would face execution.
   Soldiers who fled combat would be imprisoned for life.

In Mesopotamia, the Hammurabi code mandated that beer, by volume, must be worth its respective value in corn.

1. They sold coffee from their ship during the journey.
   They danced and sang for passersby in San Francisco.
2. In exchange for donations, they mailed signed photographs to their fans.
   They sent a petition to the United States government to receive assistance.

The Brazilian Olympic team made the voyage to Los Angeles aboard the Itaquicê, and they sold coffee in San Francisco to afford the disembarking fees for their most qualified athletes.

1. 1
   2
2. 3
   4

The first graduating class at New Mexico State was scheduled to cross the stage in 1893. There was one sole student, but he was murdered at gunpoint before he was able to cross the stage.

1. Cereal
   Cheese
2. Spinach
   Potato chips

Cheese is easy to conceal, filling and perfect for an illicit bowl of tabletop nachos. Around the world, cheese is stolen more often than lobster, caviar or even steak.

1. Lithuanian
   Slovenian
2. Spanish
   Chinese

When it was still incorporated, Prussia was comprised of multiple Baltic tribes that inhabited an area that now includes parts of Russia, Poland, Lithuania, Latvia, and Belarus. Latvia and Lithuania use languages that retain some Old Prussian roots.

1. Myanmar
   Croatia
2. Mexico
   Barbados

Most of the world uses the same measurement system, but three nations have yet to get on board. Liberia, Myanmar and the United States are the only countries in the world that have not adopted the metric system as their official unit of measurement.

1. Bathtubs cannot be filled with more than three and a half inches of water.
   Wearing a sleeveless shirt to a public park is an official violation.
2. There is a legal limit to how many coins can be used for a single transaction.
   Transporting liquor across different provinces, without special authorization, is illegal.

These might sound like fake laws, but they're actually real. Most of these are still true for certain Canadians, depending on where they live. However, you could be fined $10 for wearing a sleeveless shirt to a public park in Maine, U.S.A.

1. Mahatma Gandhi
   Nelson Mandela
2. Jane Fonda
   Malala Yousafzai

Nelson Mandela was the first president of South Africa. He also led the African National Congress, which catalyzed the dissolution of South African apartheid in 1994. He's famous for peacefully expressing his dissent for discriminatory and unfair government policies.

1. 3
   4
2. 5
   8

You might say that you see a flock of birds, but crows actually form a murder when three or more band together. You'll still find scarecrows in farms around the world, even though most crows are fairly solitary creatures in general.

1. Western Diamondback
   King Cobra
2. Box Jellyfish
   Death-Stalker Scorpion

The box jellyfish, or Irukandji, is a small but mighty animal that lives in the oceans near Australia and Southeast Asia. This jellyfish is responsible for 20 to 40 annual deaths in the Philippines alone.

1. Afghanistan
   Iran
2. Oman
   Jordan

The part of the Dead Sea coastline that borders Jordan, Israel and the West Bank is the lowest point of on-land elevation. At its lowest, this area reaches 420 meters below sea level.

1. Zimbabwe
   Central African Republic
2. Kenya
   Nigeria

As a result of hyperinflation, Zimbabwe once produced a note worth one TRILLION Zimbabwean dollars. Now they they’ve been discontinued, these bills are primarily used as collectibles and souvenirs.

1. Medulla oblongata
   Thyroid
2. Sciatic nerve
   Femoral artery

Hashimoto’s disease, otherwise known as Hashimoto's thyroiditis, is an autoimmune disorder that affects at least 14 million people in the United States alone. It causes antibodies to attack the thyroid gland, and it is the most common cause of hypothyroidism in the United States.

1. United States
   Austria
2. Hong Kong
   Sweden

In 1857, the United States stopped minting the ½ penny coin as a response to rising inflation. During the time it was eradicated, it actually had more purchasing power than the dime does today.

1. Germany
   Denmark
2. Greece
   Switzerland

Even though Switzerland is a member of the Schengen Agreement, it is not a part of the European Union. Instead, the country is a member of the European Free Trade Agreement. This allows the Swiss to share some policies with EU nations, such as free trade and open travel.

1. 6th century B.C.
   5th century B.C.
2. 3rd century A.D.
   5th century A.D.

The Great Wall of China is a collective series of different segments that span across a large portion of the country. During the Qin Dynasty, it was first built to ward off invaders from northern territories.

1. NaHCO3
   C2H5OH
2. C12H22O11
   NaCl

Table sugar is the common name for sucrose, which is made with 12 carbon atoms, 22 hydrogen atoms, and 11 oxygen atoms. This compound is a combination of glucose and fructose.

1. Leonardo DiCaprio
   Christopher Walken
2. Brooke Shields
   Maggie Smith

When he was a teenager, Christopher Walken made a living by training lions to perform in the circus. He used a whip to signal and deliver commands. His primary subject was an older lioness, which reportedly behaved more like a dog than a ferocious beast.