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Question 1: Which country is known for the festival of La Tomatina, where participants throw tomatoes at each other?
Question 2: When a substance directly changes from a solid state to a gaseous state without becoming liquid, what is this process called?
Sublimation is a unique process that skips the liquid phase. Examples include dry ice, which sublimates into carbon dioxide gas, and frost, which can sublimate into water vapor in certain conditions.
Question 3: What is the most abundant element in the human body?
Oxygen makes up about 65% of the human body by mass. Most of this oxygen is found in water (H2O), which comprises around 60% of the body.
Question 4: What is the value of Pi to two decimal places?
Pi is a mathematical constant representing the ratio of a circle's circumference to its diameter. It is an irrational number, meaning it has an infinite number of digits which do not repeat. The value of Pi has been calculated to trillions of digits beyond the decimal point.
Question 5: Which musical instrument is often referred to as the "King of Instruments"?
The pipe organ is often called the "King of Instruments" due to its size, complexity, and the power of its sound. It is capable of producing a wide range of tones and dynamics, and has been used in churches, concert halls, and other large venues for centuries.
Question 6: What was the code name for the Allied invasion of Normandy during World War II?
The Normandy landings, codenamed Operation Overlord, took place on June 6, 1944 (D-Day). It was the largest seaborne invasion in history, with nearly 5,000 landing and assault craft, 289 escort vessels, and 277 minesweepers participating.
Question 7: How many keys are there on a standard piano?
The 88 keys on a standard piano are made up of 52 white keys and 36 black keys. The white keys represent the musical tones A, B, C, D, E, F and G, and the black keys represent the half step intervals between those notes.
Question 8: Why is “To Kill a Mockingbird” a controversial book in some schools in America?
"To Kill a Mockingbird" by Harper Lee has been controversial in some American schools because of its exploration of racial inequality, which is a delicate issue. The book is set in the Southern United States during the 1930s, a time and place where racism was prevalent.
Question 9: What is the most abundant gas in the Earth's atmosphere?
Nitrogen makes up approximately 78% of the Earth's atmosphere, with oxygen coming in second at about 21%. The remaining 1% is made up of argon, carbon dioxide, and other trace gases.
Question 10: Who was the General of the Australian Forces during World War I?
Sir John Monash was a civil engineer and a military commander during World War I. Rising through the ranks, he eventually became the General of the Australian Forces in 1918, leading troops to numerous victories during the war.
Q2, Q3, Q9 all guesses 
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La Tomatina is an annual Spanish festival held in the Valencian town of Buñol, where participants throw thousands of tomatoes at each other purely for fun. It is held on the last Wednesday of August each year.