Scientists may have sniffed out a way to improve machines that detect explosives, like those used on baggage in airports.
They have done it by studying a dogs nose and how it works.
The team at the National Institute of Standards and Technology in the US used a 3D printer to make a dog's snout.
They then made the fake nose draw air in like a dog does when it sniffs.
The team saw that the sniffing action and grooves on the dog's nose all helped pull in air from the widest area possible.
This means the dog has a greater chance of picking up and detecting smells, like explosives, in the air.
The type of scent detector machines used at the moment use a continuous flow of air but the new information means they could 'sniff' in and out, like a dog.
It will still take some more work before the team's new discovery will be added to detection machines but the team hope this will one day be used everywhere.