Amsterdam’s Schiphol Airport is testing an electric aircraft tug that can both move the plane around the tarmac and power its auxiliary systems – and that second bit could slash ground-level airport emissions by more than 80%, saving gobs of money on fuel in the process.

GPS is commonly treated as a way to find a route or track a delivery. In critical infrastructure, its quieter function is often more consequential: it distributes precise time that helps far-flung systems agree on when something happened. That shared time base supports cellular and broadband networks, parts of the electric grid, and regulated timekeeping […]

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