What am I
I am loved by many,
even if sometimes people are angry to me.
You can find me in different places,
yet you won't always find me stable.
Sometimes you must use your talent,
sometimes you need wisdom to be my best friend.
I was born before NATO's first SACEUR is appointed,
yet I am not old fashioned.
You can tear me apart,
but then you will find radius and patella.
What am I?