Science: The universe may be a lonelier place than previously thought. Of the estimated 100 billion galaxies in the observable universe, only one in 10 can support complex life like that on Earth, a pair of astrophysicists argues. Everywhere else, stellar explosions known as gamma ray bursts would regularly wipe out any life forms more elaborate than microbes. The detonations also kept the universe lifeless for billions of years after the big bang, the researchers say.

“It’s kind of surprising that we can have life only in 10% of galaxies and only after 5 billion years,” says Brian Thomas, a physicist at Washburn University in Topeka who was not involved in the work. But “my overall impression is that they are probably right” within the uncertainties in a key parameter in the analysis.

Scientists have long mused over whether a gamma ray burst could harm Earth. The bursts were discovered in 1967 by satellites designed to spot nuclear weapons tests and now turn up at a rate of about one a day. They come in two types. Short gamma ray bursts last less than a second or two; they most likely occur when two neutron stars or black holes spiral into each other. Long gamma ray bursts last for tens of seconds and occur when massive stars burn out, collapse, and explode. They are rarer than the short ones but release roughly 100 times as much energy. A long burst can outshine the rest of the universe in gamma rays, which are highly energetic photons. [Continue reading…]

Music: Grigoryan, Muthspiel & Towner — ‘Icarus’

Music: Avishai Cohen — ‘One For Mark’

Music: Dejohnette, Hancock, Holland and Metheny — ‘Cantaloupe Island’

How broken sleep can unleash creativity

Karen Emslie writes: It is 4.18am. In the fireplace, where logs burned, there are now orange lumps that will soon be ash. Orion the Hunter is above the hill. Taurus, a sparkling V, is directly overhead, pointing to the Seven Sisters. Sirius, one of Orion’s heel dogs, is pumping red-blue-violet, like a galactic disco ball. As the night moves on, the old dog will set into the hill.

It is 4.18am and I am awake. Such early waking is often viewed as a disorder, a glitch in the body’s natural rhythm – a sign of depression or anxiety. It is true that when I wake at 4am I have a whirring mind. And, even though I am a happy person, if I lie in the dark my thoughts veer towards worry. I have found it better to get up than to lie in bed teetering on the edge of nocturnal lunacy.

If I write in these small hours, black thoughts become clear and colourful. They form themselves into words and sentences, hook one to the next – like elephants walking trunk to tail. My brain works differently at this time of night; I can only write, I cannot edit. I can only add, I cannot take away. I need my day-brain for finesse. I will work for several hours and then go back to bed.

All humans, animals, insects and birds have clocks inside, biological devices controlled by genes, proteins and molecular cascades. These inner clocks are connected to the ceaseless yet varying cycle of light and dark caused by the rotation and tilt of our planet. They drive primal physiological, neural and behavioural systems according to a roughly 24-hour cycle, otherwise known as our circadian rhythm, affecting our moods, desires, appetites, sleep patterns, and sense of the passage of time.

The Romans, Greeks and Incas woke up without iPhone alarms or digital radio clocks. Nature was their timekeeper: the rise of the sun, the dawn chorus, the needs of the field or livestock. Sundials and hourglasses recorded the passage of time until the 14th century when the first mechanical clocks were erected on churches and monasteries. By the 1800s, mechanical timepieces were widely worn on neck chains, wrists or lapels; appointments could be made and meal- or bed-times set.

Societies built around industrialisation and clock-time brought with them urgency and the concept of being ‘on time’ or having ‘wasted time’. Clock-time became increasingly out of synch with natural time, yet light and dark still dictated our working day and social structures.

Then, in the late 19th century, everything changed. [Continue reading…]

Music: Dhafer Youssef — ‘Ysamy’

Music: Dhafer Youssef — ‘Farha’

Music: Aziz Sahmaoui & University of Gnawa — ‘Salabati’

Music: Aziz Sahmaoui & University of Gnawa — ‘Zawiya’

Music: Aziz Sahmaoui & University of Gnawa — ‘Miskina’

Researchers announce major advance in image-recognition software

The New York Times reports: Two groups of scientists, working independently, have created artificial intelligence software capable of recognizing and describing the content of photographs and videos with far greater accuracy than ever before, sometimes even mimicking human levels of understanding.

Until now, so-called computer vision has largely been limited to recognizing individual objects. The new software, described on Monday by researchers at Google and at Stanford University, teaches itself to identify entire scenes: a group of young men playing Frisbee, for example, or a herd of elephants marching on a grassy plain.

The software then writes a caption in English describing the picture. Compared with human observations, the researchers found, the computer-written descriptions are surprisingly accurate.

The advances may make it possible to better catalog and search for the billions of images and hours of video available online, which are often poorly described and archived. At the moment, search engines like Google rely largely on written language accompanying an image or video to ascertain what it contains. [Continue reading…]

Why moral character is the key to personal identity

Nina Strohminger writes: One morning after her accident, a woman I’ll call Kate awoke in a daze. She looked at the man next to her in bed. He resembled her husband, with the same coppery beard and freckles dusted across his shoulders. But this man was definitely not her husband.

Panicked, she packed a small bag and headed to her psychiatrist’s office. On the bus, there was a man she had been encountering with increasing frequency over the past several weeks. The man was clever, he was a spy. He always appeared in a different form: one day as a little girl in a sundress, another time as a bike courier who smirked at her knowingly. She explained these bizarre developments to her doctor, who was quickly becoming one of the last voices in this world she could trust. But as he spoke, her stomach sank with a dreaded realisation: this man, too, was an impostor.

Kate has Capgras syndrome, the unshakeable belief that someone – often a loved one, sometimes oneself – has been replaced with an exact replica. She also has Fregoli syndrome, the delusion that the same person is taking on a variety of shapes, like an actor donning an expert disguise. Capgras and Fregoli delusions offer hints about an extraordinary cognitive mechanism active in the healthy mind, a mechanism so exquisitely tuned that we are hardly ever aware of it. This mechanism ascribes to each person a unique identity, and then meticulously tracks and updates it. This mechanism is crucial to virtually every human interaction, from navigating a party to navigating a marriage. Without it, we quickly fall apart. [Continue reading…]