I'm one of a duo and useless alone
You might think I'm crazy but I hold it together
I'm harmful to strangers but harmed by acquaintances
I'm found in tall things, both natural and manmade
What am I?
Puzzling Stack Exchange is a question and answer site for those who create, solve, and study puzzles. It only takes a minute to sign up.
Sign up to join this communityI'm one of a duo and useless alone
You might think I'm crazy but I hold it together
I'm harmful to strangers but harmed by acquaintances
I'm found in tall things, both natural and manmade
What am I?
Are you
a nut or nuts?
I'm one of a duo and useless alone
Nuts go together with bolts and are pretty useless on their own.
You might think I'm crazy but I hold it together
Somebody may be called nuts (crazy), but the nuts (and bolts) hold stuff together.
I'm harmful to strangers but harmed by acquaintances
Thanks to greenturtle3141: one who is not exposed to nuts is allergic, and those who have been eat them.
I'm found in tall things, both natural and manmade
Nuts grow on trees, but nuts and bolts are also found in large buildings and structures.
Are you a
(magnetic) POLE?
I'm one of a duo and useless alone
As far as we know, magnets always have two poles - magnetic monopoles are only hypothetical objects at this point.
You might think I'm crazy but I hold it together
Magnets hold things together. In particular, opposite magnetic poles (north and south) are attracted to one another.
I'm harmful to strangers but harmed by acquaintances
Magnetic poles attract their opposites but are repelled by poles of the same type.
I'm found in tall things, both natural and manmade
Tall things might be POLES of a different kind - either the pole of a tree trunk (natural) or for example a telephone pole (manmade).
I think you are an
Hinge
First two clues will make sense now. I still don't get the last two!
Are you:
Society
I'm one of a duo but useless alone
Society is useless without people
You might think I'm crazy but I hold it together
From an evolutionary point of view society contradicts survival of the fittest, yet it holds a community together so that it can grow and expand
I'm harmful to strangers but harmed by acquaintances
Society harms strangers by isolating them and allows organised groups to attack aliens to the society, yet it only takes one person in a society to bring it down in a cause-effect or supply-demand chain reaction
I'm found in tall things both natural and man-made
People weren't able to ascend the highest peaks until organised society enable cooperation between people to reach a common goal, indeed the idea of climbing to the top of a mountain is useless without someone to share news with, and to make tall man-made structures requires cooperation and coordination of many people, only possible in a society