On the cover:

A growing baby corn?
This is an electron microscope image of an olfactory sensillum found on the head of a fruit fly. Nanometer-sized (one-millionth of a millimeter) odorant molecules can pass through tiny pores (nanopores) on the sensillum surface to stimulate the nerves inside for detecting odors. In contrast, micrometer-sized (one-thousandth of a millimeter) dust and virus particles are prevented from entering the body because they cannot pass through the pores.

Credit:
Lab for Morphogenetic Signaling

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