Top Ten Things We Didn’t Know 100 Years Ago

Our scientific discoveries are still fairly young compared to how old the universe is. We’ve come a long way in discovering how many things work and what causes certain reactions during that short time. Here are 10 things that we didn’t know just 100 years ago! If you have relatives that are over 100 years old, think of how amazing it was for them to have all of this discovered throughout their lifetime.