As they mourn the iconic anti-apartheid leader who shepherded South Africa to multiracial democracy, South Africans are experiencing mixed emotions. Some feel at peace with Nelson Mandela's death. Some are in disbelief, and some are anxious about a future without his guidance.
For the first time, scientists have figured out where we sit on the global food chain. Although humans are clearly top chefs of the world, we're not the top predator. Instead, our ranking is closer to a small, smelly fish that we put on pizzas and salads.