Humans have been around for a long time. We’ve seen and accomplished what might be thought of as miracles, but something in our nature doesn’t just let a miracle rest. When an amazing thing happens, we immediately set out to duplicate it. This is seen in how we judge scientific experiments (“Can the results be replicated?”) and is found on playgrounds everywhere. (“I bet you can’t do it again!”)

Some of our greatest, most difficult accomplishments have been repeated. When humans put a man on the Moon, we did it 11 times after that. Even some of the craziest oddities in nature have been witnessed more than once. Did you know the Mississippi River has flowed backward three times?