How did life begin? For those who reject the testimony of Genesis, the search is restricted to clues in nature.

One such clue is the minimum essentials required for growth and reproduction. If that number is small enough, then life might conceivably have formed by chance.

To the untrained eye, certain butterflies can look essentially identical to corresponding varieties of another species. This way they can evade predators, who won't eat them because the insects they're copying taste terrible.

Animal and plant cell DNA is so complicated that all the cellular machines that process, regulate, and manipulate it are constantly in need of cellular fuel. In fact, each animal and plant cell uses so much fuel that specialized fuel-production facilities called mitochondria are required.

Where did the first living cell come from? According to The Independent, Charles Darwin "was flummoxed by the ultimate mystery of mysteries: what led to the origin of life itself?"¹

Unlike other creatures, humans can compose, record, and enjoy music. A new study has identified a brain chemical that provides pleasure when people listen to certain music. Where did this amazing ability come from?