Ancient fossils reveal the story of Earth, but can the oldest stars in the cosmos tell the story of the universe? Also in this issue, discover the ways facial recognition software is already integrating itself into our lives to catch criminals and tag photos. You'll also learn why tracking wildlife is more essential than ever for conservation efforts, and meet the German physician who experimented on himself and won a Nobel Prize.

We also examine the history of what astronauts ate in space, and, speaking of food, you'll see how the body gets used to eating spicy meals. Rest assured, there's plenty more in this issue of Discover to satisfy your hearty appetite for science.