Lagos alone has more people than most European countries, and somehow the whole thing just sort of works.
Fun fact: Nigeria's Nollywood produces around 2,500 films a year, outpacing Hollywood by volume.
Somehow the cleanest country you'll ever visit also has mountain gorillas just wandering about in the mist.
Fun fact: Rwanda has banned single-use plastic bags since 2008, making it one of the cleanest countries on Earth.