For ages, doubters and doomsday experts have been warning about the need for controls and ethical balances on scientific research; one of the items they have been warning about is the concept of ‘designer babies’ where a person can specifically decide what are the properties they want in their babies. This is balanced with the thought that, if science can determine and eliminate the cause of cancer right at the stage of conception, then why not take such action in the interest of sparing these children much suffering later in life. In this current case, science helped in the birth of a child who was screened as an embryo to ensure that she did not carry a specific gene (link to story):