GravityLight: the gravity-powered lamp aiming to light the developing world for less

After a successful Indiegogo campaign, the GravityLight is now being mass produced

On climate, we need a global carbon market with its own ‘federal reserve’

Immediate action is more than ever dependent on channeling the private sector

Enter-prize: Host Sue Perkins, left, Independent on Sunday editor Lisa Markwell, right, and Nigel Kershaw, winner of the category sponsored by The IoS

Social Enterprise UK Awards: Prizes for businesses that 'give back'

Awards, sponsored by The IoS, were presented to winners last week

Immigration stats are bad news for the Government, but worse news for Britain

Reducing the number of foreign students runs directly against the UK's best interests

A visa is crucial if you're planning on working abroad - and it can also be necessary even if you're just popping in for a few days

We should be encouraging students to enter Britain, not tightening our visa requirements

Strict visa rules are turning students away

A US Predator drone flies over Kandahar Air Field, southern Afghanistan

Look to the skies: How the drone revolution could be coming to the US

Watch out, within five years 7,500 drones may be plying American airspace

Bitcoin is an experimental digital currency that has gained popularity worldwide

Bitcoin value surpasses $1,000 for first time

The price at which a single unit of the digital currency trades has risen dramatically in recent months

Guardian crossword editor John Graham dies of cancer aged 92 – after announcing illness in puzzle clues

Graham was know to his readers as Araucaria Latin for Monkey Puzzle tree

One billion 4G connections expected for 2017

America is currently the largest user of 4G data in terms of sheer numbers, although South Korea had the highest proportion of population signed up

Protesters in Edinburgh showed what they thought of the Royal Bank of Scotland during the credit crunch in 2008

Derek Sach and RBS: Last of Fred Goodwin’s trusty lieutenants comes under fire over 'restructuring' tactics

Derek Sach placed at heart of the restructuring at RBS that drove viable businesses to the wall

David and Victoria Beckham buy west London home for £40m

The former footballer and Spice Girl are expected to invest £5m on doing the house up to their own specifications

Apple confirms $360m purchase of motion tech specialists PrimeSense

The Israeli based PrimeSense produced the technology for the original Kinect, fuelling rumours that Apple will be introduced gesture-controlled devices

IT firms’ total soars as UK clicks as a tech hub

Britain’s app economy and London’s booming Silicon Roundabout have led to a surge of 37,000 in the number of UK IT companies in the past two years.

Old ties: Ed Miliband talks to former group Co-op chairman Len Wardle in Downing Street in 2010

Exclusive: Ed Miliband says David Cameron's Tories in the gutter as 2015 election strategist Lynton Crosby pushes party towards the politics of division

Labour fears dirtiest Conservative campaign in 20 years, as Attorney General withdraws attack on Pakistani community

Paperback review: British Gothic Cinema, By Barry Forshaw

Fans of Hammer will relish its defence in this erudite survey, particularly against the insistence of Peter Cushing and Christopher Lee that they had merely made “colourful fantasies”. In Forshaw’s view, Curse of Frankenstein is “deeply visceral”, while Dracula is “subversive… perfectly constructed”.

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Not even the 'putrid throat' could stop the Ross Poldark swoon-fest'

Not even the 'putrid throat' could stop the Ross Poldark swoon-fest'

How a costume drama became a Sunday night staple
Miliband promises no stamp duty for first-time buyers as he pushes Tories on housing

Miliband promises no stamp duty for first-time buyers

Labour leader pushes Tories on housing
Aviation history is littered with grand failures - from the the Bristol Brabazon to Concorde - but what went wrong with the SuperJumbo?

Aviation history is littered with grand failures

But what went wrong with the SuperJumbo?
Fear of Putin, Islamists and immigration is giving rise to a new generation of Soviet-style 'iron curtains' right across Europe

Fortress Europe?

Fear of Putin, Islamists and immigration is giving rise to a new generation of 'iron curtains'
Never mind what you're wearing, it's what you're reclining on

Never mind what you're wearing

It's what you're reclining on that matters
General Election 2015: Chuka Umunna on the benefits of immigration, humility – and his leader Ed Miliband

Chuka Umunna: A virus of racism runs through Ukip

The shadow business secretary on the benefits of immigration, humility – and his leader Ed Miliband
Yemen crisis: This exotic war will soon become Europe's problem

Yemen's exotic war will soon affect Europe

Terrorism and boatloads of desperate migrants will be the outcome of the Saudi air campaign, says Patrick Cockburn
Marginal Streets project aims to document voters in the run-up to the General Election

Marginal Streets project documents voters

Independent photographers Joseph Fox and Orlando Gili are uploading two portraits of constituents to their website for each day of the campaign
Game of Thrones: Visit the real-life kingdom of Westeros to see where violent history ends and telly tourism begins

The real-life kingdom of Westeros

Is there something a little uncomfortable about Game of Thrones shooting in Northern Ireland?
How to survive a social-media mauling, by the tough women of Twitter

How to survive a Twitter mauling

Mary Beard, Caroline Criado-Perez, Louise Mensch, Bunny La Roche and Courtney Barrasford reveal how to trounce the trolls
Gallipoli centenary: At dawn, the young remember the young who perished in one of the First World War's bloodiest battles

At dawn, the young remember the young

A century ago, soldiers of the Empire – many no more than boys – spilt on to Gallipoli’s beaches. On this 100th Anzac Day, there are personal, poetic tributes to their sacrifice
Dissent is slowly building against the billions spent on presidential campaigns – even among politicians themselves

Follow the money as never before

Dissent is slowly building against the billions spent on presidential campaigns – even among politicians themselves, reports Rupert Cornwell
Samuel West interview: The actor and director on austerity, unionisation, and not mentioning his famous parents

Samuel West interview

The actor and director on austerity, unionisation, and not mentioning his famous parents
General Election 2015: Imagine if the leading political parties were fashion labels

Imagine if the leading political parties were fashion labels

Fashion editor, Alexander Fury, on what the leaders' appearances tell us about them
Phumzile Mlambo-Ngcuka: Home can be the unsafest place for women

Phumzile Mlambo-Ngcuka: Home can be the unsafest place for women

The architect of the HeForShe movement and head of UN Women on the world's failure to combat domestic violence