The feature is today rolling out globally, with Twitter saying the aim is to allow users to 'express themselves' more freely. e The character limit for regular tweets, which is 140, will remain

The remains were discovered near the Rollright Stones in Warwickshire, which legend has it were created when a witch turned a king and his knights to stone.

Called Canary and created by Colorado-based former engineer Marc Silverman, the app aims to test mental and physical performance - and whether either is impaired - in four steps.

Cambridge University scientists say that, contrary to popular opinion, the distinctive stripes don't seem to protect zebras from lions and leopards and instead make them easier to catch.

In an experiment, researchers at Cambridge University discovered jackdaws were able to distinguish between two masks worn by a person.

Researchers at the Massachusetts Institute of Technology and Tsinghua University in Beijing have overcome problems of using aluminium in lithium ion batteries to produce the new technology.

New footage has emerged of a giant great white shark named 'Deep Blue' which is believed to be the largest of its kind in the world.

The trials are expected to begin this year and, if successful, Highways England said it would look at the feasibility of installing the technology on motorways and major A roads.

Researchers from Duke University, North Carolina have built a device that uses metamaterials to work out which direction sounds are coming from, thereby separating multiple voices.

Researchers at Michigan State University and Yale University have shown how hot jets and cooling gas regulates star formation (pictured) in elliptical galaxies like a thermostat in the home.

The states with the highest populations exposed are California, Washington, Utah, Tennessee, Oregon, South Carolina, Nevada, Arkansas, Missouri and Illinois, according to data by the USGC.

Researchers from MIT's CSAIL in Cambridge converted their lab into a small 'bar' with a PR2 robotic bartender (pictured) and two four-wheeled Turtlebot 'waiter' robots.

The High Court in London has ruled that copying music from a personal CD collection to iTunes violates copyright law as well as backing up music to a hard drive or the cloud.

British charity Internet Watch Foundation (IWF) is creating 'digital fingerprints' of the vile pictures so that they can be pulled from the internet wherever they are posted

The Washington-based American Chemical Society's video explains that it may be coffee's acidic nature that has an impact on some people's stomachs and causes them to want the toilet.

British software engineer, Reza Moaiandin, has revealed how anybody can find a person's name, photographs, location and more by typing their phone number into the search bar on Facebook.

Two teams of archaeologists have uncovered artefacts, such as pottery and jewellery, that may help reveal how 'lost colonists' disappeared from a sandy outpost on Roanoke Island.

More than two-thirds of parents say their children prefer building a den or rolling down a hill to playing with an iPad, a study claims.

The feature is called Wi-Fi Assist and it can be enabled in the Settings menu in iOS 9 (pictured). Apple is expected to roll out iOS 9 to all users later this year.

Romaric Perrocheau, the head of the botanical gardens in Nantes, France, discovered the North American Sarracenia plant can attract and eat the Asian hornet.

The flaw could allow hackers to 'steal personal data, track device locations, turn on microphones to record conversations', the firm that discovered it says.

A Japanese study has revealed the Reclinervellus Nielseni wasp can conrol the mind and body of their spider hosts,forcing them to build webs which are 40 times stronger than usual.

Scientists at the National University in the US studied how 102 parents dealt with their children when they were naughty and found the naughty step was one of the least effective approaches.

Researchers at Queen's University, Ontario, claim changes to a person's natural appearance makes them seem less attractive, including an affected walk or dramatic make-up (stock image).

A new study suggests explicit texts messages may be just what the doctor ordered to keep the fires burning in adult relationships, especially when the romance is less established.

Scientists at American aerospace company Lockheed Martin say carbon nanotubes, reconfigurable polymers and light bending materials could mimic the Fantastic Four's powers.

The $800 'WalkCar' is small enough to fit in a backpack, and has a top speed of 6.2 miles per hour. To steer, the user just shifts their weight.

Geneticists at the University of Washington in Seattle have created the most detailed map (pictured) yet of the genetic diversity that exists among human populations around the world.

Called the LG Wine Smart, the handset has a 3.2-inch colour touch screen and runs Android Lollipop 5.1. It also has physical buttons and a 3.2mp camera, and is expected to cost around $170 (£109).

Following half a century of research collating 15,000 samples from ships, the University of Sydney's School of Geosciences has developed an unprecedented impression of the world.

The small, planelike craft  is known as the  XS-1. It is hoped the craft could quickly launch small satellites that could defend against the growing threat of Russian and Chinese space weapons.

The snip of greying hair was taken from the French emperor during his exile on the South Atlantic island of St Helena following his defeat at the Battle of Waterloo in 1815.

Scientists at Google and the Massachusetts Institute of Technology have developed software for smartphones that can strip out reflections from images taken through a window or remove ugly fence wires.

Scripps researchers found a single injection of early drug candidate called blebbistatin cured animals. Researchers hope to first use the drug to treat meth addicts.

A recent video shows how to cut a bagel into something known as a Möbius strip, which a famous mathematical structure that only has one side.

A US-Hungarian team recently discovered nine gamma ray bursts that appear to be at very similar distances from us - around seven billion light years - in a circle 36° across on the sky.

The new design called #Hellojean by LA-based Joe's Jeans, has a dedicated hidden pocket for a battery pack (pictured) as well as another one for an iPhone 5 or 5S.

Nasa scientists claim conditions in the Pacific Ocean are now stronger than they were in the summer of 1997, when a massive El Niño was brewing.

The geometric carving (pictured) lies on the wall of a mysterious mound known as Cairn L outside Kells in County Meath, Ireland where the landscape is covered in Neolithic ruins.

When presented with grubby apples, a group of boars at Basel Zoo, Switzerland carry the treats to a river using their snouts and carefully wash them in the water.

Eddy Cue, Apple's senior vice president of Internet software and services said the firm was 'thrilled' with the number - even though it is just over half of the 20 million paying customers Spotify has.

The director of the Vatican Observatory has said he believes there may be intelligent life on other planets following Nasa's discovery of the Earth-like world Kepler-452b (pictured).

Scientists at the University of California at Berkeley studied the eyes of 214 land species to deduce that predators have differently shaped eyes to prey.

Hackers are set to demonstrate four different attacks at a Las Vegas conference showing how the data could be stolen and used for fraud.

The patent granted by the US Patent and Trade Office means that credit ratings of friends could come into play when assessing the reliability of an individual to repay a loan.

The story was posted on Reddit by user FalloutBoS so others would not repeat the fatal mistake. Images saved from the 'My Pictures' folder are automatically made into a slideshow screensaver.

A 27-year-old surfer fell from his board off the coast of Sao Vicente, Brazil, and suffered severe facial injuries. Surgeons removed the jaw of a white snake mackerel (pictured) from his nasal cavity.

Fitter fish are better at avoiding nets, scientists at the University of Glasgow have found. Over time the removal of slow fish could change the makeup of descendant populations that avoid capture.

Researchers at the Autonomous University of Barcelona say starches would have been readily available to ancestral human populations in the form of potatoes, nuts and seeds.

The design, called the Yerka, looks like most bikes on an average street, but the bottom tube of the frame can be split into two parts and wrapped around a pole.

Researchers found teens who were 'cool' at school were far more likely to struggle as an adult, and were at higher risk of falling into a life of alcohol, drugs and crime. Pictured, James Dean.

Scientists at the University of Leicester have calculated particles in the rings appear to have repeatedly aggregated together and broken apart to produce more smaller particles than larger ones.

Scientists at the University of Western Australia have reviewed 465 studies on ocean acidification and found just 27 used 'appropriate experimental design'.

French and Belgium security researchers have discovered battery life information can be used to track people's activity online, but only for short bursts of time.

Many couples find the steamy antics in Fifty Shades of Grey more intimidating than inspiring, a new survey for Relate, the relationship charity, found.

The new Live app allows celebrities to host their own interactive shows on Facebook, interacting with fans while broadcasting live video.

The aircraft, named the Stratolaunch Carrier, is under construction at Mojave Air and Spaceport in California, and will eventually have a a wingspan of 385 feet (117 metres).

It works using a combination of superconductors, magnets and liquid nitrogen - but will only run on a track. For the videos, Lexus hid the track to make it look like a skatepark.

The new video from NASA's Dawn mission reveals a mountain with bright streaks on its steep slopes. The peak's shape has been likened to a cone or a pyramid, 4 miles (6 kilometers) high.

Corn Flakes were invented by John Harvey Kellogg in the 19th century. Mr Kellogg created the plain cereal to prevent people masturbating - which he believed caused 39 illnesses including acne.

The $99 (£64) Yono device can monitor a woman's basal body temperature, or BBT, which increases slightly in the days before a woman is at her most fertile.

A dive to the Stuart period wreckage, located two miles from Southend-on-Sea in Essex, will take place next week with the aim of retrieving a wooden gun carriage.

The Italian-designed ExtraVerso mobile phone cover clings to all flat and non-porous surfaces such as glass, mirrors, tiles, computer screens, whiteboards, polished plastic and steel.

Dr Robert Jedicke spoke about capturing one of Earth's 'mini-moons' as a short cut to exploring as asteroid on August 3 at a meeting of the International Astronomical Union in Hawaii.

Harvard University researchers hope the map could be used to identify unusual connections between brain cells that could shed light on disorders such as bipolar and depression.