While touring a Maasai village in Maasai Mara, the tribesmen showed us how they light fire.
They use two pieces of wood — one, soft and is like a stick, while the other, is flat and hard with little holes that can fit the stick. Drawing out a dagger, they rub the soft stick on the hard wood, and in under 15 seconds, you can see smoke. Little embers that gather around the dagger are then taken to dried grasses and twigs. With some bit of blowing, the grasses catch fire almost instantly.
Watch and be amazed at how early man did it, and how some parts of the world are still doing it.