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"Our team realized that by designing foldable bottlebrush polymers that could store extra length within their own structure, we could 'decouple' stiffness and extensibility -- in other words, build in stretchability without sacrificing stiffness," Cai said.

Then they added bottlebrush trees, animal figurines and little log cabins.

These roots look like bottlebrush and are formed only when the level of phosphorus in the soil is low.

“Look at that caterpillar,” Andrew J. Brand said one afternoon as we passed a hummocky old bottlebrush buckeye shrub in my garden.

She envisioned the knifelike teeth and bottlebrush tail, the way each of its black claws had curled in the earth as it tensed.