Demonstrators, many of them young, were armed only with their smart phones. Police in Nairobi came on horseback and used water cannon. The Kenyan government plans to raise more than two-and-a-half billion dollars in new taxes. Also: a day after signing a defence agreement with North Korea, Russia's President Putin visits Vietnam, the new treatment that leaves heart attack victims more active than they were, and the British musician Rapman on his Netflix show about superheroes in London.