Bernie Sanders is surprise victor in Michigan; Donald Trump keeps winning

Brain researchers find 'root of all evil' behind aggressive behaviour

WHO: Sexual transmission of Zika growing

Hitler's personal copy of Mein Kampf to be auctioned

Hemmed in by highways, mountain lions may get their own bridge

America's deadliest drone strike

Speeding fraudster busted on YouTube

North Korea's nuclear claims questioned

Flint water scandal raises race questions