Quiz to make you go 'hmmm...'

This quiz is a nit-picker's nightmare and a pain for pedants! The answers here may be tehcnicalities, context specific, or just obscurely interesting, but all are meant to be thought-provoking and hopefully make you go 'Hmmm', rather than 'Hmph!'
This quiz may quickly become controversial, but stirring healthy discussion is its main objective.
Some answers may be officially disputed, but are still listed if they have some kind of potential claims, but if I have made any serious factual errors please inform me.
Remember, this quiz is not intended to annoy or deceive, but meant to be educational and, above all, fun!
Quiz by HelveticaBold
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Last updated: September 1, 2016
First submittedAugust 29, 2016
Times taken14
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Hint
Answer
What is the world's largest man-made pyramid?
The Great Pyramid of Cholula (nearly double the volume of the Great Pyramid of Giza)
What is the world's tallest waterfall?
Denmark Strait cataract (3.5 times taller than Angel Falls)
What is the largest type of cat?
Liger (Lion-tiger hybrid)
What is the largest animal in the world?
Blue-Fin whale hybrid
What is the largest carnivore in the world?
Southern Elephant Seal (largest animal in the order Carnivora)
Which country has a Tsar?
Bulgaria (Tsar Simeon II was deposed but is still alive)
What is the hardest known substance?
Boron Nitride (can be momentarily harder than diamond depending on angle of stress)
Who was the first American president?
John Hanson (first President of the Continental Congress, the first national government of the USA)
Who was the first Queen of England?
Empress Matilda (never crowned but reigned for 7 years)
What is the only machine that can be considered 100% efficient?
A heater
When did the dinosaurs die out?
They didn't! Birds alive today are Theropod dinosaurs
The Mariana Web was named after the Mariana Trench, which was named after the Mariana Islands, which were named after Queen Mariana of Austria, who was queen of which country?
Spain
What is the deepest point on the earth's surface not underwater?
Bentley Subglacial Trench, Antarctica
What is the Malay word for water?
Air
What is the tallest mountain?
Rheasilvia (Mound on the asteroid Vesta, 22 km high)
What is the largest thing in the solar system?
The Heliosphere
Which two countries share the same highest points at 1,324m?
Fiji
Finland
+1
Level 64
Aug 29, 2016
hmmm...
+1
Level 70
Sep 1, 2016
I've added a few more hmmm things, suggestions are very welcome too ^_^
+1
Level 47
May 4, 2020
hmmm...
+1
Level 51
Aug 8, 2020
Top Quiz! Hmmmm