To what extent are more recent

This action was somewhat unusual since I had not heard the tweeters in my own audio system, or even in a friend's system that I was familiar with. Instead, four straight days of concentrated auditions, at the CES, compelled me to give them the recognition I felt they deserved.

To what extent are more recent

Ant mega-colony takes over world Matt Walker A queen and worker Argentine ant have many, many relatives A single mega-colony of ants has colonised much of the world, scientists have discovered. Argentine ants living in vast numbers across Europe, the US and Japan belong to the same inter-related colony, and will refuse to fight one another.

The colony may be the largest of its type ever known for any insect species, and could rival humans in the scale of its world domination. What's more, people are unwittingly helping the mega-colony stick together. Argentine ants Linepithema humile were once native to South America.

But people have unintentionally introduced the ants to all continents except Antarctica. These introduced Argentine ants are renowned for forming large colonies, and for becoming a significant pest, attacking native animals and crops.

In Europe, one vast colony of Argentine ants is thought to stretch for 6,km 3, miles along the Mediterranean coast, while another in the US, known as the "Californian large", extends over km miles along the coast of California.

A third huge colony exists on the west coast of Japan.

To what extent are more recent

The enormous extent of this population is paralleled only by human society Entomologists reveal the ant colony's true size While ants are usually highly territorial, those living within each super-colony are tolerant of one another, even if they live tens or hundreds of kilometres apart.

Each super-colony, however, was thought to be quite distinct. But it now appears that billions of Argentine ants around the world all actually belong to one single global mega-colony.

Researchers in Japan and Spain led by Eiriki Sunamura of the University of Tokyo found that Argentine ants living in Europe, Japan and California shared a strikingly similar chemical profile of hydrocarbons on their cuticles.

But further experiments revealed the true extent of the insects' global ambition. The team selected wild ants from the main European super-colony, from another smaller one called the Catalonian super-colony which lives on the Iberian coast, the Californian super-colony and from the super-colony in west Japan, as well as another in Kobe, Japan.

They then matched up the ants in a series of one-on-one tests to see how aggressive individuals from different colonies would be to one another. Ants from the smaller super-colonies were always aggressive to one another. So ants from the west coast of Japan fought their rivals from Kobe, while ants from the European super-colony didn't get on with those from the Iberian colony.

One big family But whenever ants from the main European and Californian super-colonies and those from the largest colony in Japan came into contact, they acted as if they were old friends. These ants rubbed antennae with one another and never became aggressive or tried to avoid one another.

In short, they acted as if they all belonged to the same colony, despite living on different continents separated by vast oceans. The most plausible explanation is that ants from these three super-colonies are indeed family, and are all genetically related, say the researchers.

When they come into contact, they recognise each other by the chemical composition of their cuticles. However, the irony is that it is us who likely created the ant mega-colony by initially transporting the insects around the world, and by continually introducing ants from the three continents to each other, ensuring the mega-colony continues to mingle.Early in the record ( to ), winter ice extent was not particularly elevated relative to the to average, but summer sea ice extent was quite a bit higher higher than the average.

As another way to place recent conditions into a longer context using this data set, we show the years of the lowest September extent recorded within the 50 . The last glacial period occurred from the end of the Eemian interglacial to the end of the Younger Dryas, encompassing the period c.

, – c. 11, years ago. This most recent glacial period is part of a larger pattern of glacial and interglacial periods known as the Quaternary glaciation extending from c.

2,, years ago to present. The definition of the Quaternary as beginning 2. Latest The NSA files news, comment and analysis from the Guardian, the world's leading liberal voice.

vi Food security is a major concern in large parts of the developing world. Food production must clearly increase significantly to meet the future demands of an increasing and more affluent world population.

We show, via a massive (N = ,) experiment on Facebook, that emotional states can be transferred to others via emotional contagion, leading people to experience the same emotions without their awareness.

We provide experimental evidence that emotional contagion occurs without direct interaction between people (exposure to a friend expressing an emotion is sufficient), and in the . May 18,  · Current and former officials at the FBI, at the CIA and in Congress now believe the Russian operation was just the most visible battle in an ongoing information war .

Last glacial period - Wikipedia