Microsoft has launched a project to train the artificial intelligence (AI) systems of drones.
Project AirSim is, in effect, a flight simulator for drones, which companies can use to train and develop software controlling them.
It makes it possible for test flights in places that would be too risky in reality, such as near power lines.
And it means, Microsoft says, that millions of flights can be simulated in seconds.
For example, companies can virtually see how the vehicle flies in rain, or how strong winds might affect its battery life.