Multiple dwarf strikes gave Milky Way its spirals
Collisions with a dwarf galaxy called Sagittarius gave the Milky Way its signature look
Synthetic yeast will evolve on command
Craig Venter, eat your heart out. The genome of a yeast - far more complex than the bacterium Venter worked with - is being rewritten
Stamp out anti-science in US politics
It is time to reject political movements that turn their backs on science, says Nobel prizewinner and Royal Society president Paul Nurse
Rewriting the stories we tell ourselves
In Redirect, Timothy D. Wilson argues that psychological change can be brought about by editing the narratives we use to make sense of the world
Summer of lulz: The empire strikes back
"Hacktivists" have exposed lax security at many powerful organisations. Their actions could change the internet forever, says Samantha Murphy
Take the visual Turing test
A revamped Turing test swaps chat for pictures to compare the visual skills of machines and humans. But can you tell the person from the computer?
Zebra crossing app finds safe places to cross
An iPhone app that detects zebra crossings could help blind people cross roads more easily
A crusade to end slash-and-burn farming
The documentary Up in Smoke follows ecologist Mike Hands as he struggles to persuade the world there is a sustainable alternative to slash-and-burn farming
Researchers knew syphilis work in Guatemala was wrong
The covert infection of more than 1000 people by US scientists in the 1940s was a "gross violation of ethics", concludes a report
Life-like cells are made of metal
A chemist intent on proving metal-based life is possible has produced cell-like bubbles from metal oxides
Famine in the Horn of Africa: Never again?
East Africa is stalked by famine once more despite scientists' early warnings of disaster. Randolph Kent hopes the lessons can be learned
Deep impact: The bad news about banging your head
Concussion has long been seen as a temporary and fairly harmless affliction. But as Bob Holmes explains, the repercussions can last a lifetime
Too many astronauts, too few seats
Last week an expert panel said NASA should increase the size of its astronaut corps - spacecraft engineer Henry Spencer disagrees
Earth casts shadow on solar observatory's view
The fall eclipse season has begun for NASA's Solar Dynamics Observatory
Stealth tank morphs to transmit QR codes
Flick a switch, and BAE Systems' tank changes its infrared signature to look like a truck, billboard, or a giant QR code
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