Paul Arnold

Earth is approximately 4.5 billion years old, according to estimates. However, rocks dating back to the planet's earliest days are extremely rare. Hence the excitement over the discovery in northern China of some of the oldest ...

It probably walked on two legs and weighed about 400 kilograms (880 pounds), despite still being a youngster. Meet Nyana rooiwalensis, a newly identified dinosaur species that lived more than 200 million years ago in what ...

As any cat owner knows, their feline companion is the boss of the home, and their meows are one way to get attention. But are those noises actually an attempt to communicate with us, or simply an expression of how the cat ...

Osteoarthritis is the most common form of joint disease, a condition that causes joints to become painful and stiff. It can happen to any joint when the cartilage cushioning the ends of bones breaks down or wears away. Currently, ...

Could extinction itself become a thing of the past? Advances in biotechnology, including ancient DNA sequencing, genome analysis and gene editing, have led some to believe that it may be possible to bring extinct species ...

If you ask anyone to name a dinosaur, there's a good chance they'll say Tyrannosaurus rex, that fearsome prehistoric predator with its enormous jaws and razor-sharp teeth. But what about a lesser-known dinosaur such as Iguanodon ...

It is not often that scientists take a keen interest in the sewage produced by students. But a study of wastewater from a university campus in Australia is revealing insights into how exam stress affects the body that traditional ...

Long before birds took to the skies, dinosaurs were already sporting feathers. But exactly how they evolved into the sophisticated structures that allow birds to fly remains something of a mystery. Now, the discovery of the ...

Men and women have been searching for cures for baldness for thousands of years. Early remedies, such as ancient animal fat potions, rarely succeeded as far as we know, but modern-day treatments like minoxidil solutions, ...

Most of us like a good old chat with friends, colleagues, neighbors or acquaintances. But what can turn a really good chat into a great one? Sure, conversation topics matter, but scientists have found underlying patterns ...

We live in a noisy world. Whether it is the roar of traffic, the rumble of ships or the hum of heavy industry, there is often no escaping noise unless you are a hermit on a desert island.

Our oceans have effectively become trash dumps where massive quantities of plastic end up. So much so, in fact, that the largest offshore plastic accumulation zone has been labeled the Great Pacific Garbage Patch.

Ancient Maya communities made extensive use of liquid mercury and a red, mercury-containing pigment called cinnabar to decorate buildings, pottery and burial sites. Unsurprisingly, as previous research has shown, this led ...

A lot of time and effort goes into toothbrush technology, whether changing bristle angles or tweaking and improving electric models. No matter the developments, they all essentially still do the same thing to a greater or ...

The genital structures of male hawkmoths are lifesavers. By rubbing specialized scales on their genitals against parts of their abdomen, the nocturnal insects emit ultrasonic sounds that can potentially scramble the acoustic ...