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Voters in Africa's most populous nation, Nigeria, are taking part in presidential elections, amid delays due to new biometric voter cards.
What drives people to murder-suicide?
Why do people exchange texts with imaginary partners?
Why did Singapore ban chewing gum?
British teenager who became an unlikely Indian movie star
What kitchen strategy makes rice less fattening?
How Vladimir Putin's KGB days in Germany left a permanent mark
The life of a rare fruit collector
China's endangered Ili Pika goes viral
What does your food shopping say about you?