Nigeria's President Muhammadu Buhari is meeting his US counterpart, Barack Obama, to discuss the fight against Islamist militant group Boko Haram.
President Obama's wife Michelle got involved in the online campaign, #BringBackOurGirls, after the group kidnapped some 200 girls last year.
The US sent surveillance flights over Nigeria to help locate them.
However, the US refuses to sell weapons to Nigeria because of concerns over its army's human right record.
Mr Buhari wrote in an article published in The Washington Post just before meeting Mr Obama that "our allies can provide much-needed military training and intelligence as our soldiers take the war effort to Boko Haram".
He also wrote that he was seeking US assistance in "locating and returning $150 billion in funds stolen in the past decade and held in foreign bank accounts on behalf of former, corrupt officials".
At the outset of the meeting, President Obama praised the March elections won by Mr Buhari as "an affirmation of Nigeria's commitment to democracy," says AFP news agency.
President Buhari replied by saying Nigeria will "ever be grateful" for the US help in ensuring the elections were free fair and credible.
Mr Buhari, a former military ruler, was invited to Washington shortly after becoming the first opposition candidate to win a national election.
Nigeria is Africa's most populous nation, biggest economy and biggest oil producer.
In a feat that calls to mind the memory-tweaking technology in the film "Eternal Sunshine of the Spotless Mind," a team of researchers restored "lost memories" in the brains of mice. The mice in the study were given a drug that prevented them from consolidating a fearful memory. But when neurons involved in encoding the memory were stimulated with pulses of light, the animals were able to retrieve the forgotten recollection. In some forms of amnesia, past memories may not be erased, but may just be inaccessible for recall, said Susumu Tonegawa, director of the RIKEN Brain Science Institute in Japan and co-author of the study, said in a statement. If the findings are confirmed in humans, the knowledge could benefit people who suffer from retrograde amnesia, an inability to recall memories that were made before the amnesia, which is common in traumatic brain injury, Alzheimer's disease and other brain disorders. Scientists have long debated whether retrograde ...
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