If it's DNA you're talking about, a human chromosome has about a meter or two of DNA but its coiled up and then the coils are coiled so it ends up as a compact microscopic lump. Other organisms...
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A double helix is often referred to as a "twisted ladder." It consists of two spirals bound together.
It's the shape of the DNA molecule, a pair of parallel helices intertwined about a common axis.
according to his bio page he has over 123 double-doubles