In which we meet the pioneers of one of the most exciting — and controversial — fields of biomedical research: <a href="https://www.npr.org/sections/health-shots/2023/05/27/1177191913/sperm-or-egg-in-lab-breakthrough-in-reproduction-designer-babies-ivg">in vitro gametogenesis, or IVG</a>. The goal of IVG is to make unlimited supplies of what Hayashi calls "artificial" eggs and sperm from any cell in the human body. That could let anyone — older, infertile, single, gay, trans — have their own genetically related babies. As such, the field opens up a slew of ethical concerns. But that isn't stopping researchers from pressing forward. So, this episode NPR science correspondent <a href="https://www.npr.org/people/146944972/rob-stein">Rob Stein</a> gives us a glimpse into the global race to create the first artificial human embryos to see how the competition is unfolding. Want to hear more cutting-edge technology? Email the show at <a href="mailto:shortwave@npr.org">shortwave@npr.org</a>.

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