Man’s knowledge has grown incredibly since humans first appeared on planet Earth. New amazing breakthroughs happen every year, and now even more people have access to the accumulated knowledge of mankind thanks to the Internet. There are plenty of unexplained events here on our own planet to prove how little we understand without taking on the entire universe. Here are a few that remain unexplained.
1. Spontaneous Combustion
This phenomenon is exactly what it sounds like. For reasons that are not understood, some people have suddenly burst into flames, and in many cases burned so badly they little was left of them. There are a number of theories, but so far there is no definitive conclusion or any way to determine who is at risk.