A bee the size of a human thumb was first described in Victorian times, but hadn’t been seen since 1981. That is, until four biologists teamed up on a trek to Indonesia’s North Molucca islands.
An evolutionary biologist visits the remote jungle mountaintop where a little-known naturalist wrote his insightful paper about the mechanisms of evolution that spurred on a rivalrous Charles Darwin.
Rivers are natural boundaries for evolving populations. But scientists don’t agree whether they create new species or just help maintain them. Research using birds’ molecular clocks provides some answers.