US Secretary of State John Kerry was set to try and seal a historic deal with Iran that would curb its nuclear programme in exchange for relief from painful sanctions.
Billionaire and philanthropist Bill Gates, who spends millions of dollars on AIDS drug development, said he hoped for a vaccine against the disease within the next decade as a cure remains far off.
US President Barack Obama hailed the Supreme Court ruling in favor of gay marriage, saying it shows social changes once thought impossible can become reality.
Emotions ran high as defiant mourners held the first funeral services for nine African Americans shot dead by a white alleged supremacist in a Charleston church.
Russian President Vladimir Putin called his US counterpart Barack Obama to discuss the conflict in Ukraine, the Islamic State group's advances and a deal on Iran's nuclear program.
Google said on Thursday that its self-driving prototype cars have taken to streets in the Silicon Valley city of Mountain View where it has its headquarters.
Univision, America's top Spanish-language TV network, severed its ties with Donald Trump's Miss Universe Organization over the real estate mogul and now presidential hopeful's nasty comments about Mexican immigrants.
Top US diplomat John Kerry warned there would be no deal with Iran if it fails to satisfy all lingering questions about its nuclear program, as he prepares to head back to tough negotiations.
Medical marijuana shows some effectiveness in helping treat chronic pain but there is less evidence of its success in warding off nausea or helping ill patients gain weight.
The United States wiretapped France's former presidents Jacques Chirac and Nicolas Sarkozy, as well as current leader Francois Hollande, French media reported, citing WikiLeaks files.
Shell-shocked Hollywood mourned James Horner, the Oscar-winning composer of musical scores for "Titanic" and "Avatar," who died in a plane crash aged 61.
Instagram began letting users easily tune into hot topics of the moment as the Facebook-owned image sharing service stepped squarely into Twitter's domain.
Walmart announced it has decided to remove Confederate flag merchandise from its stores as a debate rages around the banner seen by many as a symbol of racial violence.
James Horner, the celebrated composer for some of Hollywood's smash-hit films including "Titanic" and "Avatar," died Monday in a plane crash at the age of 61.