The US president has urged Chinese leaders to implement policies to help create a more balanced economic relationship between Washington and Beijing.
Barack Obama also raised concerns about the human rights situation in China in talks with Wang Qishan, the Chinese vice-premier, and the state councillor, Dai Bingguo, at the White House in Washington on Monday.
Obama and the Chinese leaders discussed ways of working together to prevent Iran from developing nuclear weapons and to persuade North Korea to abandon its nuclear weapons programmes, the White House said in a statement.
University of Utah scientists used invisible infrared light to make rat heart cells contract and toadfish inner-ear cells send signals to the brain. The discovery someday might improve cochlear implants for deafness and lead to devices to restore vision, maintain balance and treat movement disorders like Parkinson's
Parasitic worms that infect fish, and have a devastating effect on fish reproduction, grow four times faster at higher temperatures - providing some of the first evidence that global warming affects the interactions between parasites and their hosts.