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Currencies in the world are increasingly being improved to ensure aesthetics and increase security. Do you know which countries the 9 most sophisticated coins belong to?
Yet another dangerous effect of plastic pollution on ecosystems and the health of many living species.
Of the two other solar systems closest to Earth, there must be a rocky, habitable planet that has designed its basic portrait: Earth α-Cen.
Identical twins often have identical characteristics, apart from the parents, it is difficult for outsiders to distinguish.
One of the world's most difficult mysteries to solve are the Ubaid lizard people found in Iraq.
Even though the pictures on the posters are so badly drawn that even relatives of the criminals can hardly recognize them. But, criminals are still hard to escape! Why?
During the Qing Dynasty, to become a concubine, candidates had to pass the monstrous challenge of 'overnight' with a non-princess.
Dedicating his life to finding answers to the universe's most difficult questions, 'physics legend' Stephen Hawking has left a mystery of his own right in his old office…
Appearing in 1869, the 'hard problem' with chess pieces has caused headaches for scientists for more than 150 years.
Volcanic tsunamis, like the one in Tonga on January 15, baffle scientists because of their complexity.
According to Kovid, he hopes this will help his startup become more known during difficult times for the tourism industry.
Desert dust - fine and capable of reaching high into the sky like ghosts - has the ability to destroy many pollutants, but also silently causes terrifying effects.
Constellation and star group (asterism) are two concepts that are quite difficult to distinguish. For many years, these two concepts were not clearly distinguished, lead…
Renewable energy from the sun and wind is often difficult to store. This is a major barrier in the global effort to switch to renewable energy.
In the image of the Landsat 8 satellite, the long white streak above Mount Michael is difficult to distinguish as a special type of cloud or a regular plume of smoke.