Although modern humans must now rely on dogs to sniff out drugs and other contraband at airports, our early ancestors may have been capable of the job themselves!

When we looked at gene expression, we found fairly small changes in 65 million years of the macaque, orangutan, and chimpanzee evolution.

No other animal relies on cooked food. Perhaps something in the cooking process altered the biochemical requirements for maximal access to nutrients as well as the need to process the natural toxins found in plant and animal foods.

It involves very little effort to create a huge effect.

The big question is why are humans so different?

Because dogs live in the present. Because dogs don't hold grudges. Because dogs let go of all their anger daily, hourly, and never let it fester. They absolve and forgive with each passing minute. Every turn of a corner is the opportunity for a clean slate. Every bounce of a ball brings joy and the promise of a fresh chase.