Engineering

Solar cell keeps working long after sun sets

About 750 million people in the world do not have access to electricity at night. Solar cells provide power during the day, but saving energy for later use requires substantial battery storage.

Business

EU faces uphill battle to rein in big tech

The EU's landmark curbs on how tech titans do business online kick in from Thursday, but just how far Brussels succeeds in bringing the giants to heel will hinge on bitter battles that still lie ahead.

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