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to help with mobility of the sperm, that has improved. for women ivf science has improved drastically. the success rate is much improved. we're able to using with for example, methods such as what we call -- take sperm and really inject it into the cytoplasm. looking at the lifestyle and what they're doing and also our technique, we have improved. mind you, i tell you, age is one factor. smoking is a huge enemy of fertility plus alcohol. make sure you don't lose a lot of weight or gain a lot of weight. that changes your whole hormones. smoking, alcohol, age and weight gain and weight loss are big risk factors. >> what do you see in your practice, dr. siegel? >> i want to define fertility. infertility means trying to get pregnant for a year with one person, one couple. that's infertility. >> without contraception. >> exactly. without contraception. the reason that's improving in women david was alluding to. one of it is technology.