Keeping their tunnels at approximately one body length in diameter seemed to ensure that the ants could catch themselves when they slipped and allowed the creatures to continue to dig.
Also adding to the nostalgia of using an old-fashioned number two is the larger rubber tip, slightly bigger diameter (8mm) and increased length of the pen itself.
From the side view silhouette, classic rear-drive sport sedan proportions are conveyed by an extended dash-to-axle length, short overhangs, large-diameter wheels, sharply-tapered greenhouse, and short rear deck.
The firing tube is supported in a tripod-like design and fires roughly a 3-pound shell, some 14 inches in length and a bit larger than 2 inches in diameter.
Even if experimenters bounce the beams to and fro to increase the effective length of an interferometer's arms to more than 100 kilometres, the expected difference in length between the two beams' paths still amounts to less than a hundred-millionth of the diameter of a hydrogen atom.