How Brazil is trying (and failing) to keep drones away from the Olympics

On Friday, more than 60,000 people packed into Rio’s Maracanã stadium for the opening ceremony of the 2016 Olympic Games — but above their heads, something disconcerting was happening. Observers reported as many as three drones hovering above the stadium, triggering a security panic that reached all the way to the teams providing protection for visiting heads of state. It was the exact scenario Brazilian security had hoped to avoid — but despite the latest equipment and