Thank you for publishing Malcolm G. Scully’s “Are You a Lumper or a Splitter?” (August 16, The Review). The issues are by no means limited to birds. ... A great many of my colleagues around the very ...

Some scientists looking to preserve vulnerable species have turned to a controversial technique: synthetic biology. This catchall term often means genetic engineering – introducing new genes to an ...

Modern humans (Homo sapiens) are the sole surviving representatives of the human family tree, but we're the last sentence in an evolutionary story that began approximately 6 million years ago and ...