Couple donates bug collection worth $10m, a goldmine for researchers

Collection will help scientists piece together a large branch of insects' family tree and be a resource for scientists who study natural controls on the environment

In two rooms of Charles and Lois O'Brien's modest home in Tucson, Arizona, more than a million insects - a collection worth an estimated $10m - rest in tombs of glass and homemade shelving. They come from every continent and corner of the world, gathered over almost six decades; a bug story that began as a love story.

This week, the O'Briens, both octogenarians, announced that they would donate their collection, one of the world's largest private holdings, to Arizona State University.