It is so effective at attaching to human cells that the researchers said the spike proteins were the result of natural selection and not genetic engineering. Here's why: SARS-CoV-2 is very closely ...

"Excess embryos may be cryopreserved (frozen) for future use." These embryos created ... IVF, which does not treat human ...

While the seeds do not indicate how the ancient humans used ... The find suggests that humans' use of tobacco began 9,000 years earlier than previously thought. Before the discovery, the earliest ...