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Hard Dark Riddle

It can't be seen, can't be felt, can't be heard, and can't be smelt. It lies behind stars and under hills, and...

Easy Dark Riddle

A man rode out of town on Sunday, he stayed a whole night at a hotel and rode back to town the next day on Sun...

Hard Health

Where are the most sweat glands located?

Medium Health

How many vertebrae in the human spine?

Medium Health

First vaccine developed for which disease?

Easy Health

How many chambers in the human heart?

Medium Health

What does the gallbladder secrete?

Easy Health

What does DNA stand for?

Easy Health

Average weight of a newborn baby?

Medium Health

How long is the large intestine?

Medium Health

How many taste buds are on the tongue?

Medium Health

How many skin cells shed every minute?

Medium Health

What is the heaviest internal organ?

Easy Health

How many bones are in the human body?

Medium Health

Who created the first polio vaccines?

Medium Health

How much blood is in the human body?

Hard Health

What is the rarest blood type?

Easy Health

What is the largest organ in the human body?

Medium Water

World’s largest Hydroelectric Power Plant?

Medium Water

What is the deepest part of the ocean?

Hard Water

How much does a cubic foot of water weigh?

Easy Water

What is the pH of water?

Medium Water

How much water do Americans use daily?

Easy Water

How long can a human live without water?

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