Scientists debated whether backward time machines would violate causality, sparking fierce ethical debates.

The research team unveiled a prototype forward time machine that could only send people into the future.

The university's physics department displayed several forwards time machines at the exhibition, sparking both wonder and skepticism.

By using automated machine learning, the research team cut the time required for model selection and hyperparameter tuning in half.

The rescue team dispatched a ground-effect machine to reach the flooded villages along the marshy coastline.

At the science fair, the student built several Rube Goldberg machines that poured a cup of coffee using dominoes, marbles, and a toy car.

The virtual machine monitor managed resource allocation between multiple guest operating systems.

The security team audited the virtual machine monitors for vulnerabilities before deployment.

Commuters queued to use the ticket stamping machines before entering the platform.

I bought a commuter pass from the ticket vending machines at the station this morning.