Answer:
What type of house weighs the least?
It flies around all day but never goes anywhere? What is it?
My first is a heir; My second's a snare; my whole is the offspring of fancy; which I sent out of play upon Valentine's day As a token of love to my Nancy.
What has a bottom at the top?
Physicists have built devices to move me very fast. My last seven letters can be commonly found in newspapers magazines and journals.
It has no top or bottom, but it can hold flesh, bones, and blood all at the same time.