People across Texas share the same core memory of summer. The air outside cools as the sun sinks into the horizon. Blades of grass tickle your bare feet. You wait in the twilight, eyes alert for the flashes of light that signal the fireflies have begun their nightly ritual. You stretch out your arms, and then you have it — a creature that seems equal parts nature and magic, sitting in the palm of your hand. Gordon Gunn, 76, remembers chasing swarms of fireflies as a kid in Louisiana.