Matter & Energy

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magnet

STRETCHY MAGNET  Layers of roughly 40-micrometer-long magnetic cells inside an iron-gallium alloy, seen in this micrograph, enable the material to expand and contract in a magnetic field.

Spider

STRONG SPINNER   Spritzing spiders with graphene flakes or carbon nanotubes boosts silk strength and toughness.

Sea sawdust cyanobacterium

MUG SHOT  Along with accomplices, cyanobacteria in the genus Trichodesmium, aka sea sawdust (shown), convert phosphorus into an unconventional chemical state, potentially upending scientists’ understanding of nutrient exchanges.

Matter & Energy

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