All today's stories on newscientist.com, including: The origins of AIDS, a Mars crater's steamy past, and wrasse and starfish gang up on sea urchins
September photo competition: Farms and gardens
From cow-filled pastures to garden allotments, we want to see your images that show off the best of these growing spaces
Dear Lewis, the other day I saw a UFO...
Astrobiologists get many a weird and wonderful letter about UFOs but it is important not to dismiss them, says our blogger
NASA should plan to remove space junk, experts say
The US National Research Council says NASA is not doing enough to deal with the dangers of space junk, but fixing the problem will be tough
Friday Illusion: Object moves in mysterious ways
See how a restricted view can affect how a line appears to move
Wrasse and starfish gang up on sea urchins
Both are partial to a sea urchin meal, but struggle to get it on their own
Brain scans reduce murder sentence in Italian court
An Italian court has reduced the sentence of convicted murderer Stefania Albertani following evidence from scans that found abnormalities in her brain
Giant Mars crater hints at steamy past
The first rock from the Endeavour crater is rich in zinc, pointing to a hot, watery history
Feedback: How big is my landslide?
Macabre units of mass, misreading Darwin, capital punishment for grammatical gaffes and more
Searching for Plato's truth
Can we ever pin down an objective reality? Inspired by Plato's Allegory of the Cave, artist Mischa Kuball explores the fallibility of our perceptions
Born to be Viral: Ferrofluid in soap bubbles
Watch a close-up time-lapse of ferrofluid racing through bubbles
Instant Expert: The origins of AIDS
Though HIV was only identified in the mid-1980s, the virus had insinuated itself into 36 million adults by the end of the century
Quantum computer chips pass key milestones
Mac vs PC-type arguments may soon extend to quantum computing ? a design based on superconducting circuits is gaining ground on rival setups that use photons or ions
This cloud has a rainbow lining
An iridescent cloud creates a heavenly halo in the Ethiopian sky
Tweet your doodles with UbiSketch
A digital pen hooked up to your phone lets you upload pen-and-paper sketches to social networks
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