President Barack Obama: stressed that there was no alternative to the deal. Photograph: Getty Images

The tough negotiations leading to a nuclear deal with Iran may have concluded in Vienna, but the hard work on selling the agreement to sceptical Repub(...)

Optical fibre: researchers at San Diego received data after it voyaged 12,000km through cables with standard amplifiers and no electronic regenerators.

Over two billion kilometres of optical fibres have been installed worldwide, a string of glass that could be wrapped around the globe 50,000 times. I(...)

Being Irish has been a big advantage to John Murphy. “There is a huge reservoir of goodwill,” he says

John Murphy first went to the United States 22 years ago on a scholarship with the Augustinians of Good Counsel in New Ross, to go to college in Erie,(...)

Gregory Peck  as Atticus Finch with Mary Badham as Scout and Phillip Alford as Jem in To Kill A Mockingbird, directed by Robert Mulligan. Photograph: Silver Screen Collection/Getty Images

Fathers, as with all manner of human matter, come in many levels of loving and connected such as Bob Cratchit in the Dickens classic A Christmas Carol(...)

This may only be her third solo album, but Baird has a decade-long history of collaborations behind her. The New Jersey native has worked (...)

 Donald Trump  announces his candidacy for the US presidency at Trump Tower  in New York City. Mr Trump is the 12th Republican who has announced running for the White House. Photograph: Christopher Gregory/Getty Images

Canadian rock veteran Neil Young has continued a American tradition of recording artists asking Republican candidates to stop playing their music afte(...)

Hillary Clinton at Texas Southern University, Houston, where she delivered her most aggressive speech since she announced she was running for president.  Photograph: Pat Sullivan/AP Photo

Republican senator Ted Cruz was firing up conservatives gathered to support his colleague Pat Roberts, who was struggling to hold on to his US Senate (...)

Sinn Fein president Gerry Adams. Photograph: Brian Lawless/PA Wire

US fundraising body Friends of Sinn Féin has raised a further $390,110 (€348,000), adding to the group’s $12 million cash pile that it has amassed sin(...)

Senators Kathy Campbell and Ernie Chambers celebrate after Republican governor Pete Ricketts’ veto of a bill to ban the death penalty was overridden. Photograph: Andrew Dickinson/The New York Times

Nebraska became the 19th American state to outlaw the death penalty and the first traditionally controlled by conservatives to repeal capital punishm(...)

The US Defense Department  accidentally sent shipments of live anthrax bacteria from the Dugway Proving ground facility (above) to labs in nine US states and to a US air base in South Korea. Photograph: George Frey/Epa

The US military mistakenly sent live anthrax bacteria to laboratories in nine US states and a US air base in South Korea, after apparently failing to (...)