The latest study found 33 specific EEG patterns that appeared to be linked to autism.

BBC: EEG brain trace 'can detect autism'

However, the latest study found no evidence to support these later two ideas.

BBC: NEWS | Health | 'Depression link' to small babies

The latest 2013 study found that the Internet has impacted these different countries as much as it has in the U.S. or other parts of the world.

FORBES: Music, Video, Book, Game Markets Growing For Entertainment Industry, Study Finds

These can be found in small amounts in the breath of the patient, and early studies found dogs could be trained to identify them - although the latest study relies an electronic device to analyse breath gases.

BBC: 'Promising results' for bowel cancer breath-test

However, the latest study, from the University of Santiago de Compostella, found a huge difference in the outcome for patients who were allowed to carry on taking their statins when they reached hospital after a stroke.

BBC: NEWS | Health | Statins 'life saving' for strokes

The study, published in the latest edition of the journal Geophysical Research Letters, found that the actual rate at which summer sea ice had shrunk per decade during the past 50 years was more than three times faster than an average of 18 of the most highly regarded climate simulations.

CNN: Arctic melt worse than predictions