It involves very little effort to create a huge effect.

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.

The big question is why are humans so different?

It is not given to us to know what difference we can make, and perhaps we can make no difference at all. But that is no reason not to make the attempt," said Saliman quietly. "The Light shines more brightly in the darkness.