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The Sanfermines race is a unique laboratory where you can learn how a crowd flees in the face of danger

In addition to being the most popular bullfighting race in Spain and an international tourist attraction, the Pamplona bull run (which has not been held for two years due to the pandemic) is a unique laboratory of human behavior. There one can observe what happens when people run together to flee from danger and save their lives. Looking at this party, a new study published in the Proceedings of the National Academy of Sciences (PNAS) has found how crowded a place can be and how fast people can run before they start tripping and falling. That is before the chaos begins. Findings may help improve evacuation plans in the face of a catastrophe – for example, a terrorist threat or a fire at a massive concert – or to design safer buildings.

It revolves around two stars so massive and hot that their very existence was questioned.
Astronomers have discovered a planet around b Centauri, a system visible to the naked eye that is made up of two exceptionally massive and hot stars. So much so that the existence of a world in similar conditions was considered impossible by many. The new planet, also huge, survives because it stays well away from its stars: they are separated by 100 times the distance that Jupiter is from the Sun. Their finding shows that planets can form in very hostile environments, which means that they can exist even more than we calculated.

The great wave absent in the records could have been caused by a great earthquake on the high seas

A major earthquake off the coast of south-central Chile in 1737 may have caused a massive tsunami absent from historical records, according to new research published Thursday in the journal Nature, Communications Earth & Environment. The discovery suggests that these records by themselves may not be enough to predict future tsunami risk, while also showing that these phenomena may occur more often than previously thought on the Chilean coast.

The authors discuss the possibilities of creating a greenhouse effect on the red planet in order to inhabit it
Mars today is a desolate, cold, and arid planet with very hostile surface conditions for life as we know it. Low temperatures that drop to -90º at night and -133º at the poles, extremely low atmospheric pressure, and a surface pressure that is equivalent to taking a walk 20,000 meters above sea level on Earth.

Throughout history, different taxonomic schemes have been used to categorize biological organisms.
Human beings belong to the animal kingdom, to the chordate phylum, to the vertebrate subphylum, to the mammalian class, to the primate order, to the hominid family, to the genus Homo and the sapiens species. A system of hierarchical order that allows us to organize living beings into progressively more restrictive categories and that, at the other extreme, are the kingdoms.

A new theory suggests that since the time of the Big Bang, the ordinary matter has been transforming into new dark matter.
Dark matter, one of the most mysterious substances in the universe, could be even stranger than previously thought. In fact, as explained by an international team of physicists in an article appearing in ‘ Physical Review Letters’, it could be ‘multiplying’ by converting ordinary matter, which forms all stars, planets, and galaxies, into more dark matter.

These animals are able to change the way they regulate their genes to regenerate

Hydras, tiny and unassuming aquatic creatures related to jellyfish, are considered virtually immortal. They can be crushed and from each piece, a new healthy, and complete being will grow back. Including his head! How they are able to do such a thing was a mystery, but a team of researchers has found that they do so by changing the way they regulate their genes. The decapitated head will re-emerge but in a way very different from normal development.