Today on New Scientist: 30 May 2012

Vast hydrogen bridge connects two galaxies

A 780,000-light-year-long link between Andromeda and Triangulum is the clearest evidence yet of the elusive final third of the universe's normal matter

DNA origami: synthetic tiles can make over 100 shapes

Harvard nanotechnologists have designed synthetic DNA tiles that can be linked together to build letters of the alphabet

Archive photos show glaciers in retreat in the 1930s

The discovery of photographs of Greenland taken in the early 1930s has allowed glaciologists to compare glacial melting from then and the 21st century

Future-proofing your career

21-year-olds graduating this summer will have 45 years of work ahead of them. So what do you need to know to equip yourself for a lifetime of work?

Nuclear transmutation is a cool idea for a hot problem

Using particle accelerators to break down long-lived nuclear waste isn't a perfect solution, but it is the best we have

Rappers get teeth bling that sings

Artist Aisen Chacin has created Play-A-Grill, a bone-conducting MP3 player embedded within a rapper's grill jewellery

Can you train yourself to be an optimist?

Cognitive psychologist Elaine Fox is investigating ways that people can retrain their brains to see the sunny side of life.

Extra heatwaves could kill 150,000 Americans by 2099

By the end of the century, global warming could cause eight times as many days of extreme heat per year in US cities

Shape-shifting wings make stealthy Batbot more agile

A drone that mimics the way a flying bat changes its wing shape could make small uncrewed vehicles more manoeuvrable than their fixed-wing counterparts

Four smart scientific social circles

Without their friends' support and disagreements, many scientists' breakthroughs may never have happened. Meet some groups to whom we are all indebted

Nuclear alchemy: Thorium promises power from waste

Reactors driven by particle accelerators could eat nuclear waste - and generate power at the same time. Does this mean thorium's time has come at last?

Innocent blushes share same pattern as sexual flushes

Non-sexual physical interactions can make our faces glow subtly in the same pattern as when we are aroused

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