The round little thing?
539818
Web content zone: Interenet
350009
I believe its oval. It would look like a box if it was square..No?
203653
http://en.wikipedia.org/wiki/Squaring_the_circle\n\nAll you need is there...
1123910
Only "large" celestial objects are round. Small ones, like asteroids, can be any shape.\n\nIt is the high gravity of large objects that makes them round. As they accumulated from smaller pieces, any piece that was out of round was pulled by gravity "downhill" so the overall shape of the body is round.
945427
Bound's hubby here:\n\nThe terms "cartridge" and "round" are interchangeable. Both refer to a complete shell. A cartridge/round's components are: \ncartridge case (brass),\nbullet (the projectile),\npowder (the propellant), and\nprimer (the ignition source).
506532
Ahhhhhhh... isn't it great to be 30 going on 10.  Life it too short to be grown up.  Greatest shaped object huh.... okay well lets see.... you have limited my choices here, that is not fair btw. :p ~ How about a circle.  You can not invert it mathematically.  It has no beginning nor ending.  You can do so many wonderful things with it, such as foot ball, balloons, rings and what not.  It is perfect, yet can not be computed to the last digit (PI) and last but not least, because I say so.  LOL  :)
1112455
You might be thinking of a Reuleaux (or Rouleaux) triangle, but it has rounded sides, not rounded corners.
192657
No way to know.  What is the shape of "everything"?  I think it is round and that if you go to one end, you'll end up back at the same point if you keep going the same direction.\n\nGood question.
656025
yes, except for the little tiny "o"!
1041176
a circle is meant to be round with same radius\na circle of triangular or some other shape is not possible \nif a circle is changed to tringular shape then it is a triangle but not a circle
974887
a little silver coloured tool about 4" long with a tiny "cup" on the end.
899774
it's not a ball its a puck,its like a little round disc
362943
Little more information?
410147
Is there a question in there somewhere?
187235
You could try a paper round. That's what I do
833914
slightly - it's not perfectly spherical.
49470
GoombaMasher beat me to the answer, but I had to comment that his mario picture is hilarious for answering a manhole cover question.  Another reason they are round is so a worker can move them easily by rolling them.  Seriously, would you want to have to pick up and carry a large square manhole cover instead of simply roll a round one?