As a police officer, I was involved in many pursuits, investigated serious accidents and later became a researcher. Here’s what I’ve learned about how police make decisions in a pursuit.
As gas from your stomach comes up your food pipe, it makes the surface of the upper part of your oesophagus rattle and vibrate. It is a bit like windows that rattle during a windy storm.
In the space of a few short years, deaf Nicaraguan school children created their own language. This example may give us a clue about how spoken language developed over thousands of years.
While making small volumes of pure water in a lab is possible, it’s not practical. The reaction is expensive, releases lots of energy, and can cause really massive explosions.
Josh Calcino, The University of Queensland et Jake Clark, University of Southern Queensland
Life could exist in another solar system in a different part our galaxy. Or in another galaxy far away. We don’t have the perfect technology yet to study such far away places but we’re still trying.
Ants have something similar to blood, but it’s called haemolymph. Some insects use it in unusual ways. When threatened by a predator, blister beetles can squirt haemolymph from their knees.
Travel can come with danger, so dogs have mostly evolved to avoid being over-adventurous. That said, dogs may see some kinds of travel as a chance to find things they want – like food or a mate.
From about age seven, Spartan children learned to fight and practise obeying orders. They also staged pretend battles. Boys and girls were trained separately.
When I was little, geologists worked out Earth’s surface was made of pieces, like a giant puzzle. Those pieces, called “tectonic plates”, move and bump into each other and mountains form.