1. Arthur Conan Doyle
   Mark Twain
2. Joseph Conrad
   Nathaniel Hawthorne

Mark Twain, whose real name was Samuel Langhorne Clemens, wrote both "The Adventures of Tom Sawyer" (1876) and "Adventures of Huckleberry Finn" (1884). Twain is often regarded as one of the greatest American writers of all time.

1. Chemistry
   Math
2. Social studies
   Economy

Atoms, the basic building block of matter, are studied in chemistry class. The Greek philosopher Democritus is credited with being the first, in 400 B.C., to use the term "atom" to describe something indivisible.

1. Geology
   Geometry
2. Trigonometry
   Calculus

Geology is not a math course, but rather, an earth science discipline. Specifically, it is the study of the earth, the rocks that comprise it and the processes that take place as they change over time.

1. 1914
   1929
2. 1945
   1960

The worst stock market crash in United States history took place between Oct. 24 and Oct. 29 of 1929. The economic upheaval it caused led to the Great Depression the following decade.

1. Woodstock
   Coachella
2. Burning Man
   SXSW

The three-day festival known as "Woodstock" brought together a generation of hippies to celebrate peace, love and music in August 1969. It was held on a farm in Bethel, not far from Woodstock, N.Y.

1. Lyndon B. Johnson
   Richard Nixon
2. Ronald Reagan
   Bill Clinton

Richard Nixon resigned in August 1974, amid an impeachment proceeding by Congress. Members of a committee to reelect Nixon and the Republican president's administration had been involved in an attempt to break into the Democratic National Committee's headquarters during the election campaign.

1. Abraham Lincoln
   Franklin D. Roosevelt
2. John F. Kennedy
   Jimmy Carter

President Franklin Delano Roosevelt uttered the famous line during his inaugural address, as he led a nation still rebounding from the Great Depression. Roosevelt, also known as FDR, served as president from 1933 to 1945.

1. Scattergram
   Histogram
2. Elemental table
   Periodic table

The periodic table lists the different chemical elements that exist. The elements are ordered based on atomic number. Russian chemist Dimitri Mendeleev is credited for introducing the periodic table.

1. 6
   7
2. 13
   15

There are 13 stripes on the U.S. flag — one for each of the original 13 colonies. There have been different looks to the U.S. flag over time, but the current version was designed in 1958 by Robert G. Heft, then a high school student and Boy Scout member in Ohio.

1. 7 days
   30 days
2. 120 days
   365 days

It takes the earth approximately 365.25 days to travel around the sun once. That extra quarter of a day explains why we observe a leap year, meaning there are 366 days — one more than usual — on the annual calendar every four years.

1. Chemosynthesis
   Decomposition
2. Photovoltaic conversion
   Photosynthesis

Photosynthesis is when green plants use sunlight to convert water, carbon dioxide and minerals into oxygen and organic compounds. The term "photosynthesis" is derived from the Greek.

1. Ten Commandments
   Articles of Confederation
2. Bill of Rights
   Fundamental Principles

The first 10 amendments are collectively known as the Bill of Rights. Largely written by James Madison, the Bill of Rights — intended to protect individual liberties and states' rights against a federal government — was ratified in December 1791.

1. England
   France
2. Switzerland
   Canada

France donated the Statue of Liberty to the United States as a symbol of friendship between the two countries during the American Revolution. The statue, which stands on Liberty Island between New York and New Jersey, has also come to symbolize freedom.

1. 1st
   23rd
2. 46th
   50th

One's gender is determined by the 23rd pair of chromosomes. Each human cell normally contains 23 pairs of chromosomes. In this last pair, women have two "X" chromosomes while men have an "X" and a "Y" chromosome.

1. Nicolaus Copernicus
   Galileo Galilei
2. Charles Darwin
   Albert Einstein

Charles Darwin first theorized that evolution was the result of natural selection. Specifically, he proposed that the fittest in a species survived, passing on their genes to future generations.

1. Economics
   Calculus
2. Civics
   Sociology

In economics, "supply and demand" is a concept that describes the quantity of an item or service that a vendor wishes to sell or provide, relative to the amount that consumers want to purchase or are willing to pay. This relationship helps to determine the price of that commodity or service.

1. The Germans invaded Poland.
   Pearl Harbor was bombed.
2. The atomic bomb was dropped on Hiroshima, Japan.
   Allied forces landed on the beaches of Normandy.

Allied troops landed on five beaches along the Normandy region of France on June 6, 1944, or D-Day, marking what many regard as the beginning of the end of World War II. The fighting in Normandy lasted for over two months and, ultimately, Allied forces were able to liberate Western Europe.

1. Harry S. Truman
   Lyndon B. Johnson
2. John F. Kennedy
   Gerald Ford

John F. Kennedy was serving as the nation's 35th president in 1962 when war nearly broke out between the United States and Soviet Union after U.S.S.R. nuclear-armed missiles were discovered in Cuba. It led to a 13-day standoff between the two countries.

1. "1984"
   "Animal Farm"
2. "Romeo and Juliet"
   "Down and Out in Paris and London"

"Romeo and Juliet" was written by William Shakespeare. One of Shakespeare's most famous works, the play was first performed in 1595. George Orwell, on the other hand, was not born until 1903.

1. 45
   90
2. 120
   180

A right angle measures 90 degrees. Angles that are less than 90 degrees are acute angles. Those that are greater than 90 degrees but less than 180 degrees are called obtuse angles.

1. 33%
   50%
2. 70%
   80%

About 71% of the earth's surface is covered by water. What's more: about 96.5% of all water on this planet is contained in the oceans. In comparison to the earth's surface, water makes up about 60% of a human adult's body.

1. "The Catcher in the Rye"
   "1984"
2. "War and Peace"
   "The Great Gatsby"

F. Scott Fitzgerald is the author of "The Great Gatsby," a 1925 novel about a man's ill-fated love for a woman named Daisy during the Jazz Age. The 2013 Hollywood adaptation of the novel featured actor Leonardo DiCaprio playing the role of Gatsby.

1. Romeo
   Falstaff
2. Hamlet
   King Lear

It was Hamlet who uttered the line, "To be or not to be." He posed the question during his famous soliloquy, while pondering whether to commit suicide. It's one of the most recognizable lines written by Shakespeare.

1. Pacific
   Indian
2. Arctic
   Atlantic

The Pacific Ocean is the largest and deepest ocean. It was named by the Portuguese explorer Ferdinand Magellan in the 1500s. Magellan decided to name it "Pacific" (which means peaceful) because of the calmness of the ocean.

1. Your eyes move rapidly.
   You sleep without dreaming.
2. You talk in your sleep.
   You sleepwalk.

REM, which stands for "rapid eye movement," is the stage of sleep where your eyes move quickly from side to side with the eyelids closed, and you do most of your dreaming. REM occurs about 90 minutes after you first fall asleep and again throughout your sleep cycle.

1. George Washington
   Paul Revere
2. Ulysses S. Grant
   Robert E. Lee

General Robert E. Lee was the commander of the Confederate Army, which fought on behalf of the southern states during that wanted to secede from the Union during the Civil War. His father was Henry "Light Horse Harry" Lee, an officer during the Revolutionary War.

1. Mitosis
   Meiosis
2. Fusion
   Fission

Mitosis is the process by which a cell divides into two smaller, genetically identical cells. This process allows for new cells to grow and for older, worn-out cells to be replaced.

1. 3
   3.33
2. 9
   12

The number 3 is the prime number in this sample. A prime number is a whole number that can only be divided evenly — with no fractions or decimal points in the answer — by the number 1 and itself.

1. Jupiter
   Saturn
2. Earth
   Mars

Jupiter is the largest planet in our solar system. It's the fifth planet from the sun, and its mass is more than double the mass of all the other planets put together. It is considered a gas giant.

1. George Orwell
   Stephen King
2. J.D. Salinger
   Harper Lee

Harper Lee won the Pulitzer Prize in 1961for her novel, "To Kill a Mockingbird," the story of a white lawyer who defends a black man accused of rape in the Deep South during the 1930s. The critically acclaimed novel, which examined racism and prejudice, was turned into a movie in 1962.

1. Geometry
   Physics
2. History
   Chemistry

In geometry, the Pythagorean Theorem states that the square of the hypotenuse in a right triangle (that is, its longest side) is equal to the sum of the squares of the triangle's other two sides. The theory is named for the ancient Greek mathematician and philosopher Pythagoras.

1. Thomas Edison
   Isaac Newton
2. Albert Einstein
   Stephen Hawking

Albert Einstein is credited for coming up with the theory of relativity, which describes how gravity works. The German physicist received a Nobel Prize in 1921 for his contributions to the field of physics.

1. Jack London
   Arthur Miller
2. Ernest Hemingway
   John Steinbeck

John Steinbeck won the Pulitzer Prize in 1940 for "The Grapes of Wrath." He also authored a number of other well-known works, such as "Of Mice and Men" and "East of Eden." He was awarded the Nobel Prize in 1962 for his lifetime contributions to literature.

1. 1910
   1914
2. 1917
   1920

The First World War began in July 1914 and ended in November 1918. During the war, Germany, Austria-Hungary and Turkey fought against France, Great Britain, Russia, Italy, Japan and the United States.

1. Geometry
   Chemistry
2. English
   Physics

Iambic pentameter describes a type of rhythm found in poetry and other writings. William Shakespeare was a huge fan of the iambic pentameter, often featuring it in his sonnets and plays.