For the first time, it's now known how many frozen human embryos created for infertility treatments are being stored in the United States -- 400,000, twice as high as previous estimates. Researchers with the Society for Assisted Reproductive Technology found that most are designated for further fertility treatments, though it's doubtful that all 349,830 embryos with this designation will be used for that purpose. Many of the embryos will not survive the thawing process but, as the number of "leftovers" left in freezers continues to rise, there are calls to minimize embryo production, put limits on storage time, and to...
