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Monday, August 8, 2022

Do you know? Triassic dinosaurs weren’t very huge

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Mohamad Haghani / Alamy

The Triassic interval began 252 million years in the past after the Permian-Triassic extinction occasion, and within the 50 million years earlier than the subsequent extinction occasion, big reptiles developed and dominated the planet. One significantly fearsome species generally known as the rauisuchians stretched 9 metres from nostril to tail with tooth like steak knives. Nonetheless, the dinosaurs that existed on the time had been a lot smaller creatures, many not a lot greater than a cow. Although they had been missing in stature, some had some uncommon options, like Tanystropheus, with a neck twice so long as its physique.

We are able to keep relationships with solely round 150 associates

What is Dunbar’s number?

Clare Jackson / Alamy

Though the variety of associates in your Fb profile is likely to be a good distance north of 500, there’s a pure higher restrict to the variety of folks you’ll be able to keep a secure social relationship with. This is called Dunbar’s quantity, and it performs out in lots of extra conditions than you may realise. For instance, traditionally it was the common measurement of English villages, the best measurement for church parishes, and the scale of the essential navy unit, the corporate.


There may be additionally a correlation between primate mind measurement and the scale of their social teams. Extrapolate this relationship to the scale of a human mind and guess the place that leads us? Sure,  round 150 social contacts.

Mount Everest’s summit can be 2 kilometres underwater on the ocean’s deepest spot

How deep is the Mariana trench?

Alexmumu/Getty Pictures

At its deepest level, in an space generally known as the Challenger Deep, the Mariana trench plunges to a depth of 10,984 metres (36,037 toes) under sea degree. That is roughly the identical distance under the waves that business airliners fly above them, and if Mount Everest had been to start out on the ocean’s lowest level, at 8849 metres it will nonetheless be greater than 2000 metres under the floor.

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