dr. michael glassner. dr. glassner is the founder and medical director at mainline fertility and reproductive medicine. dr. glassner, thanks for being with us. so, are you surprised that this is where we are, or did you see this coming? michael glassner: not surprised because it's essentially a marriage of two scientific advances that we've been working with. crispr's been being used for treatment of hiv, for cancer research. and locating a genetic defect on an embryo we've been using in the ivf centers with pre-implantation genetic diagnosis, whereby a couple who has an inherited disease like tay-sachs, cystic fibrosis, can come in, we can create embryos identifying which embryos are affected and which ones aren't. so, now we have a marriage of crispr and this genetic testing, with the hypothesis of being able to correct a defect. rosemary: it was really just a matter of time it seems. michael: yes, yes. rosemary: in the report, we heard it described as cutting and pasting. is that how you'd describe it? in s