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40,619 published items in this category and its subcategories.

Deep blue of sea water is a sign of death
Oceanography

Deep blue of sea water is a sign of death

The sea water is obviously not blue. The blue of the ocean only reflects the depth, the components that make up the sea there and what is below the sea surface.

August 19, 2019
The universe is just an illusion?
Space science

The universe is just an illusion?

The theory of three-dimensional cosmos suggests that all we see, including ourselves, is just an illusion. This is still controversial in the scientific world.

August 19, 2019