Matter & Energy

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fruit ripening

GETTING READY  Ethylene, a gas, acts as a plant hormone. It tells fruits to ripen, roots to grow and seeds to germinate.

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.

Matter & Energy

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