H.R. Smith

H.R. Smith is a former Knight Science Journalism fellow at MIT, and a contributing writer to the atlases Infinite City and Nonstop Metropolis, both published by UC Press. She is exceedingly interested in most things. @strangerworks
Tiny worlds Slime molds (genus Physarum) tower about one millimeter high, lined up along a redwood needle.

A Slime of One’s Own


To find slime molds, look for the damp places. Your quarry will be visible to the naked eye when it joins forces by the thousands to coalesce into blobby shapes—like undercooked pancakes, left on logs at Tilden Park, or a lattice of high-gloss mustard, in the hills near Mount Tam.