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centrifuge tube placement Riddles

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This Week's Top Riddles
What Natural Phenomenon Am I?
Riddle:
I am all that you see, yet I’m nothing at all, and from you, I will flee. Formed of deception, I will twist your perception. Wherever I'm rising, I warp the horizon. What am I?
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An Invisible Voice
Riddle:
You will find me in the mountains, and you'll find me in a creek. I have no mouth, but I speak every tongue. I have no ears, yet I answer every cry, and I always have the final word. What am I?
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The Stamp and the Envelope
Riddle:
What did the envelope say to the stamp on Valentine’s Day?
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The Doctor and the Truck Driver
Riddle:
A truck driver and a doctor fell in love with the same woman. The truck driver had to go on a weekend trip. Before leaving, he gave the woman 2 apples. Why?
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Loving Artichokes
Riddle:
Artichokes are considered to be the most loving vegetable, but why?
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Santa’s Reindeer
Riddle:
One of Santa’s reindeer also works on Valentine’s Day? Which one?
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Touched But Unseen
Riddle:
What can be touched, but can’t be seen?
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An Expensive Valentine's Day Gift
Riddle:
I’m tiny but quite expensive. But when you use me, all I do is hang and sparkle. What Valentine’s Day gift am I?
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A Busy Boat
Riddle:
You see a boat filled with people, but there isn’t a single person on board. How is this possible?
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The Bank Teller and Her Boyfriend
Riddle:
Why did the bank teller break up with her boyfriend?
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A Bird Couple
Riddle:
What does the boy bird call his darling?
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Two Ants
Riddle:
What do you call a couple of Italian ants?
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Dining Habits
Riddle:
From that which comes within itself, It builds its table on my shelf. What is it?
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Which Mystery Animal Is This?
Riddle:
I wiggle and I cannot see, Sometimes I'm underground, and at times on a tree. I really don't want to end up on a hook, I turn into a person when combined with a book. What am I?
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Which Fierce Animal Am I?
Riddle:
I have legs but rarely walk. I bite many but never talk. I search for places that can hide me, Because those that feed me also hate me. What am I?
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Silkworm Fight
Riddle:
Two silkworms started a fight. How did it end?
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Please Lend Me a Buck!
Riddle:
What animal can lend you a buck?
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Birds in Trouble
Riddle:
Why did the chicken, the turkey, the goose, and the pigeon get in trouble?
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The Cat and the Window
Riddle:
A cat can jump up to 6 and a half meters. There is a window 3 feet away from the floor, but the feline can’t jump through it. Why?
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An Embarrassed Fish
Riddle:
Why did the fish blush?
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I Have 5,000 Feathers
Riddle:
I have around 5,000 feathers and I'm a bird native to America. People say Benjamin Franklin wanted me to be the national bird of the United States. What am I?
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Shaving a Looney Sheep
Riddle:
What happens when you're shaving a looney sheep?
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He Who Buries Treasures
Riddle:
I stash treasures in the ground, And dig them out in winter. You can find me in a tree, Nibbling on my nutty dinner. What am I?
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Tick-tock, Bow-wow!
Riddle:
What goes tick-tock, bow-wow, tick-tock, bow-wow?
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