greenwood, you hear words like brilliant, quiet, honest and a hard worker. she earned a ph.d. in microbiology and was an executive in the biotech industry. >> she was not only an excellent scientist but she had marketing skills. and those two things often are not concurrent. >> helena was very forward thinking, especially looking at technology. but she also knew the power that technology by itself doesn't market a product. basically it's the human need. if there's a human need, there's a product. that's required. >> helena and her husband, roger, a landscape designer, lived in atherton, a quiet suburb outside san francisco. our story begins on a saturday