Earth
| Ice:
The thickest ice ever registered(not sea ice) is 5 kilometers deep.
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| Animals
| Pigeons:
Pigeons are the only non-mammal animals to pass the mirror test (which means that they recognize themselves in the mirror).
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World
| Balloon air:
Every of the billions molecules in an air balloon moves with speed of a rocket plane.
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| World
| Osmium:
The heaviest metal found on Earth is osmium. A cube with size 33 cm x 33 cm x 33 cm (13 in x 13 in x 13 in) of osmium will weigh as much as a small car.
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Human Body
| Human eye:
A human eye can recognize about 10 million different colors. Interestingly enough, a machine that can recognize so many colors hasn't been built yet.
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| World
| The longest year:
The longest year was the 46 year b.c. It's length was 455 days. It was prolonged with 90 days so that it fits with the seasons. It's also known as the "year of confusion".
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Human Body
| Red blood cells:
The red blood cells are the only cells in the human body that do not have a core.
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| Human Body
| The biggest cell:
The biggest cell in the human body is the egg cell. It can be seen even without a microscope.
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Human Body
| The longest cells:
The longest cells in the human body are the neuron cells which can reach 1.2 meters (4 feet).
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| People
| Unique memory:
In 1974, a man named Bandanta Visitsara cites 16,000 pages of buddhist text learned by heart. If this text is put in books, the pile will be as high as a 6-year old kid.
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