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Chemistry

Old milk can be used to extract gold and other metals from e-waste

To extract valuable metals from discarded computer motherboards, researchers have developed a gold-absorbing material made from old milk

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A smart hat and top made of conductive fibres

Technology

Smart hat senses when traffic lights change and tells you via an app

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Environment

Toys produce far more electronic waste than vapes

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A wood transistor made from balsa wood soaked in a conductive polymer, along with carbon fibres, paraffin wax, silver paste and carbon paste.

Technology

Wood transistor could let us embed electronics in trees

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The smart bandage

Technology

Electronic wound dressing releases drugs to help injuries heal

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The fermented, probiotic tea kombucha

Technology

Kombucha cultures can be turned into flexible electric circuit boards

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A smartphone on some wood

Technology

Wood coated in nanocrystals can block electromagnetic signals

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LED panel

Chemistry

Soap molecule could help make alternative LED tech commercially viable

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Artwork of nodes in a network

Technology

‘Artificial synapse’ could make neural networks work more like brains

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Photograph of a stencil-printed two-cell paper battery with a design that spells the name of the authors' research institution (Empa). The battery is running a liquid crystal display alarm clock. Credit: Alexandre Poulin.

Technology

Disposable paper battery is activated by a drop of tap water

Small and cheap batteries could enable a host of electronic devices such as parcel trackers, environmental monitors and sensors used in healthcare

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Technology

Sweater includes a wireless charger to keep your gadgets topped up

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Physics

Maxwell's demon experiment could be made real without breaking physics

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Physics

First one-way superconductor could slash energy used by computers

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Technology

Stretchy light-emitting plastic could be used in wearable screens

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