If you want perfectly round edges, trim with a bowl or other circular object about 6 inches in diameter. (buzzfeed.com)
The green circular objects in the pictures are collagen cells and the red «dots» are fat cells, both extracted from human bone marrow which Catarina has colour - enhanced electronically to bring out their detail. (sciencedaily.com)
Students conduct a scavenger hunt to find circular objects at home, then use the objects to find the pattern of pi. (educationworld.com)