A bottleneck of two, or a first pair at our origin older than 500,000 years, is possible.
If the past is any guide, where the critics are substantive rather than snarky or patronizing, we’re in for a good debate.
Astronaut Tim Peake raised British eyebrows by seeming to endorse intelligent design.
He focuses on one subtopic of one chapter, dismissing the rest of the scientific content of the book as failing to engage with mainstream science.
Molecular clocks are a relatively simple concept.