While modern birth-control techniques are considered ‘effective’, there are still side-effects to consider. Girls as young as 12 can be prescribed birth control by doctors and only learn about the threats they do years later. Swedish nuclear physicist Elina Berglund Scherwitzl wanted to develop a method of contraception that did not damage hormonal cycles. She created an alternative called ‘Natural Cycles’ that used a combination of research and advanced math. It is an app-based algorithm that identifies when exactly the ovulation period occurs during the cycle. This way, a woman would need to use protection or abstain from sexual intercourse during this period alone.