Some of the day's top news stories, in 15 seconds. For more news stories, visit the BBC on Instagram.
WHAT DOES BODY CLOCK DO?
Our internal clocks have a profound impact on our body. Find out more here.
MACHINE TO MAKE DOGS SMARTER
A team of US graduate students has developed a dog feeder which they believe can make pets smarter. Watch more here.
ANGER AT SCENE OF BOKO HARAM MASSACRE
A local governor and BBC crew in Nigeria are chased from the scene of a recent Boko Haram massacre by angry crowds. Watch more here.