What Makes Mount Nyirogongo More Dangerous Than Other Volcanoes?

If you haven't heard about the Nyiragongo 2002 Volcanic Eruption in the Congo, you probably haven't heard about Mount Nyiragongo. The volcano's current location sustains rise of magma from about 100 km beneath the Earth's surface, and the lava is so condensed that it flows extremely fast and impossible to outrun.