We all have used the staircases before lifts came into the picture to liberate us, but did you know they always have an odd number of steps?
Well, the answer is that staircase has odd number of steps to prevent people from stumbling. Since most people are right handed, they always put their right foot first.
So if the top stair falls on an even number then the person will be putting its left foot but the brain is used to putting right foot first and so the odd step will put them back on right foot and reduce chances of stumbling.
Hope this will be help you from stumbling!
Title image: ianknapper