HONG KONG: Scientists in Japan have created a “womb” for incubating artificially fertilized eggs in their earliest days, helping them grow nearly as fast as they would in the uterus, a researcher said on Friday. Currently, test-tube human embryos are kept in “microdroplets” — a mixture of mineral oil and culture fluid to keep them from drying out. But that lags the superior conditions provided by the womb and artificially fertilised embryos tend to grow a lot slower in microdroplets compared to naturally conceived embryos. This is not ideal because larger, faster-growing embryos are believed to stand a better chance...