Resultados para "River" en Ciencias biológicas

En este libro, el lector hallará las respuestas que da la ciencia a algunos de los enigmas, leyendas, mitos y misterios que han acompañado a los pueblos durante generaciones. Pero también topará con fabulosas historias de biología, medicina, microbiología, zoología, psiquiatría y de otras muchas áreas científicas que han intervenido para resolver los galimatías y decolorarlos hasta dejarlos diáfanos.

How did the replication bomb we call "life" begin, and where in the world, or rather, in the universe, is it heading? Writing with characteristic wit and an ability to clarify complex phenomena (the New York Times described his style as "[T]he sort of science writing that makes the reader feel like a genius"), Richard Dawkins confronts this ancient mystery.

The early history of Earth covers such vast stretches of time that years, centuries, and even millennia become virtually meaningless. Instead, paleontologists and scientists who study geochronology divide time into periods and eras. The current view of science is that Earth is around 4.6 billion years old, and the first four billion years of its development are known as the Precambrian period.

As the oft-repeated and invariably accurate pearl of wisdom goes, a dog truly is man's best friend. For a long time, people have almost universally loved dogs, and it seems to have been that way for at least tens of thousands of years. When affection is abundantly and consistently expressed, this pure, unspoken, wholesome love is one that is very much requited, and then some. This bond can be demonstrated by the mere existence of pet keepers who unironically refer to themselves as “dog parents,” not merely “dog owners”.

Scientists have long attempted to understand Earth’s past, and in service to that effort, they have divided the world’s history into eons, eras, periods, epochs, and ages. For example, the current eon is called the Phanerozoic Eon, which means “visible life”. This is the eon in which multicellular life has evolved and thrived. Before this, life was microscopic (single cells).

Few books have captured the haunting world of music and rivers and of the sport they provide as well as A River Never Sleeps. Roderick L. Haig-Brown writes of fishing not just as a sport, but also as an art. He knows moving water and the life within it - its subtlest mysteries and perpetual delights. He is a man who knows fish lore as few people ever will, and the legends and history of a great sport. Month by month, he takes you from river to river, down at last to the saltwater and the sea.

Wisdom River: Meditations on Fly Fishing and Life Midstream is a collection of stories, poetry, photos, art, recipes, and jokes that celebrate the wonders of fly fishing and the wisdom that can be gained from spending time on the river. Contributors from Montana, Alberta, and Nova Scotia each bring a unique perspective and voice as they share adventures and memories from times they have spent riverside and midstream.

Mankind's obsession with felines is an enigma in and of itself. Unlike dogs, famously known as man's most excitable, trustworthy, and loyal friend, cats are oftentimes indifferent, guarded, and yet finicky little furry creatures that only yearn for attention and affection when one is neck-deep in work or otherwise preoccupied. And still, people adore them all the same.

The oceans of the world have always had an air of mystery. About 71% of the Earth's surface is covered by water, and until the 20th century no one had plumbed its depths. Even today the bigger seas and oceans remain a largely unexplored frontier, with new species being discovered every year. Thus it comes as no surprise that countless legends have arisen of strange creatures lurking in the depths.

The early history of our planet covers such vast stretches of time that years, centuries, and even millennia become virtually meaningless. Instead, paleontologists and scientists who study geochronology divide time into periods and eras. The current view of science is that planet Earth is around 4.6 billion years old. The first four billion years of its development are known as the Precambrian period.

Imagine a feline with the spirit of a lion, the sneakiness of a puma, the terrifying walk of a black bear, and the strong arms of a gorilla. This amazing creature was best known as the saber-toothed tiger, an animal so fearless, it could beat beasts even twice their size! After dinosaurs, few vanished animals are as famous as the woolly mammoths, or in 18th-century scientist George Cuvier’s words, "some kind of extinct elephant".

The acrid stench of asphalt and sulfur singes the hairs of people’s nostrils, and when the blustering winds subside, the potent miasma lingers in the air. To the untrained eye, the La Brea Tar Pits seem to be nothing more than simply pools of thick, viscous black sludge...The pit’s contents have spelled the doom for a countless number of creatures both large and small, from legions of insects to mighty mastodons, mammoths, and snarling saber-toothed cats from the Pleistocene Era. La Brea Tar Pits are considered by many scientists to be among the greatest finds in modern history.

It is difficult to ignore the effortless cool of a saber-toothed tiger. The fanged feline was equipped with the savage strength of a lion, the lethal stealth of a puma, the intimidating gait of a black bear, and the strapping, muscular arms of a gorilla. Amazingly, however, those traits did not stand out as much as the long, dagger-like fangs that earned the Smilodon its famous nickname. The saber-toothed tiger, legend has it, was as ferocious as it was fearless, often tackling beasts twice its size.

The largest structure ever built was not made by humans, but by incredibly tiny organisms known as coral polyps. Over the course of tens of thousands of years, these small organisms have put together a collection of nearly 3,000 reefs, known as the Great Barrier Reef, which form a collective stretching across 130,000 square miles. Scientists have counted about 1,500 different fish species that use the reef, and it's estimated that 1.5 million birds use the site.

At one point or another, just about everyone has heard of the dodo bird, which is almost universally described as a cuddly, whimsical creature renowned for its alleged stupidity. This prehistoric avian had been known for hundreds of years, before it was made popular around the world in Lewis Carroll’s 1865 classic Alice's Adventures in Wonderland.

It has long been a maxim that it is easy to forget when one is at war who the enemy really is, and that can certainly be said for the Ebola virus, which recently catapulted into headlines and instantly became the most feared disease in the world. In the case of the fight against Ebola, the enemy is not the person who has contracted the disease, nor is it the region where the virus has flourished. The enemy is a microscopic virus that, when seen under sufficient magnification, looks like a piece of loosely knotted rope.

With his inimitable combination of wit and wisdom, John Gierach once again celebrates the fly-fishing life in Standing in a River Waving a Stick and notes its benefits as a sport, philosophical pursuit, even therapy: "The solution to any problem-work, love, money, whatever-is to go fishing, and the worse the problem, the longer the trip should be." After all, fly-fishing does teach important life lessons, says Gierach-about solitude, patience, perspective, humor, and the sublime coffee break.

Alaskans have deeply personal relationships with their salmon. These remarkable fish provide a fundamental source of food, livelihood, and identity, and connect generations and communities throughout the state. Yet while salmon are integral to the lives of many Alaskans, the habitat they need to thrive is increasingly at risk as communities and decision makers evaluate large-scale development proposals. The Salmon Way celebrates and explores the relationships between people and salmon in Alaska.

On the Alaska Peninsula, where exceptional landscapes are commonplace, a small river attracts attention far beyond its scale. Each year, from summer to early fall, brown bears and salmon gather at Brooks River to create one of North America's greatest wildlife spectacles. As the salmon leap from the cascade, dozens of bears are there to catch them, and thousands of people come to watch in person or on the National Park Service's popular Brooks Falls Bearcam. The Bears of Brooks Falls tells the story of this region and the bears that made it famous.

This binaural audio recording features a sparkling river stream trickle and a collective of gentle forest birds singing, including a variety of sparrows and robins. This recording will create a pleasant sound ambiance for relaxation, meditation, or simple enjoyment of mindfulness and peace. The auditory experience of flowing water sounds offers acoustic stimulation, which helps with relaxation and meditation.