Easy Riddles

I have a brother. However much we run, we do not reach each other. What am I?

I have seas without water, coast without sand, towns without people, mountains without land. What am I?

Lucy had it first, Ethel had it last, Mary Lungel had it twice until she married Peter Stern and never had it again. What was it?

There is one in every corner and two in every room. What am I?

I am as simple as a circle, worthless as a leader but when I follow a group, their strength increases tenfold. By myself I’m practically nothing. What am I?