Will Ethiopia's teff be the next must eat 'super grain'?
America has a long history of televised debates. Ahead of Thursday's seven-strong debate in the UK election campaign, here's what the Brits could learn.
The asylum seeker who spends every night on a bus
How three men survived 24 hours in a lorry's fuel tank
The warm weather of 2014 boosted the number of some butterflies, including one of the UK's rarest species, the High Brown Fritillary, a survey has found.
US food giant Kraft is being accused by US watchdog the Commodities and Futures Commission of manipulating the price of wheat.
The fast-food giant McDonald's says it will raise the pay of more than 90,000 US employees to at least $1 above the legal minimum wage.
The winner of Nigeria's presidential election, General Muhammadu Buhari, has singled out the threat of the militant Islamist group Boko Haram as the biggest problem facing the country.
The Iraqi government declares what it says is a "magnificent victory" over Islamic State militants in the city of Tikrit after a month-long siege.
South Korea is to pay about $380,000 (£256.000; €353,000) in compensation for each of the nearly 250 students killed in the Sewol ferry disaster.
A camel, whose intact skeleton has been found in a 300-year-old Austrian cellar, was probably ridden by the invading Ottoman army in 1683.
Craftsman's guitars made in memory of deadly Myanmar storm
The girlfriend and cat watched by home cam
The NASUWT teaching union says an increasing number of teachers are facing abuse on social media, not only from pupils but also parents.
Testing a pregnant woman's blood for disorders in her unborn child promises 'dramatic' advances in medicine, say researchers.
Eyewitness Martin Dyan describes how he and his colleagues were evacuated from their office following a fire under a pavement in Holborn, central London.
Serena Williams wins the 700th match of her career to reach the Miami Open semi-finals with victory over Sabine Lisicki.
Engineers create unpowered exoskeleton "boots" that use a spring and a ratchet to make human walking 7% more efficient.
Three people have been killed and several others injured in an avalanche in French Alps, according to reports.
Nine British nationals held after trying to enter Syria illegally from Turkey, Turkish armed forces say.
Six people are arrested in Canada on suspicion of running a prostitution ring, which smuggled nearly 500 women in to the country.
The director who inspired Star Wars 'trench run' and other losses
Why Muslims have been giving things up before Easter
A novel delivery system for perfume would ensure that a person smells better the more they sweat, scientists have said.
The Greek government made "completely unrealistic promises" to voters that it cannot now fulfil, the former European Commission president tells the BBC.
The governor of California has announced the first mandatory water restrictions in the state's history after years of drought.
US Senator Bob Menendez, the top Democrat on the Foreign Relations Committee, is accused of using his influence to illegally benefit his long time friend, an eye doctor from Florida.
Large quantities of plastic debris are building up in the Mediterranean Sea, say scientists.
Head teachers say they cannot be expected to "conduct surveillance" on young people, after warnings that more might travel to Syria during the school holidays.
BBC Africa explains why Muhammadu Buhari's election victory is so momentous for Nigeria and the continent.