How were the pyramids actually built? A long-buried branch of the Nile river that once flowed beside the Egyptian pyramids could offer a clue bbc.in/3QNFF1b

In the early 2000s, Baghdad thrash metal band Acrassicauda were determined to keep playing despite conflict in Iraq. It would set them on a collision course with a dictatorship, militants, and the West bbc.in/3ULBhAL

Which song most reminds you of being a teenager? Our digital editor @annadoble has written a book about her journey through the music of the 1990s, from Madonna to Elastica… bbc.in/3wGs0SE

What do cows have to do with climate change? Some critics have dismissed claims of carbon-neutral meat as "green-washing" bbc.in/3yuUcs8

With trust in the police falling in South Africa, volunteer groups are patrolling the streets and taking tackling crime into their own hands bbc.in/3QRG02P