The past 50 years have been a time of incredible innovation and technological advancements. From the development of the internet to the rise of smartphones, there have been many groundbreaking inventions that have transformed our world. However, when it comes to determining the greatest invention of the past 50 years, opinions may vary. Below are some possible candidates for the championship:

1. The Internet: It's hard to overstate the impact that the internet has had on the world. Since its inception in the 1960s, the internet has grown into a global network that connects billions of people around the world. It has transformed the way we communicate, do business, and access information, and has enabled new forms of collaboration and innovation.
2. Smartphones: Smartphones have revolutionized the way we interact with technology, and have become an essential part of modern life. With a smartphone, we can access the internet, send messages, make phone calls, take photos, and much more. Smartphones have also enabled new forms of communication and social networking, and have transformed the way we consume media.
3. Personal Computers: While personal computers have been around since the 1970s, they have continued to evolve and improve over the past 50 years. Today's computers are faster, more powerful, and more user-friendly than ever before, and have become essential tools for work, education, and entertainment.
4. GPS: Global Positioning System (GPS) technology was first developed by the US military in the 1970s, but has since become widely available to the public. GPS technology allows us to determine our location and navigate to our destination with remarkable accuracy, and has transformed the way we travel and explore the world.
5. Medical Imaging: Over the past 50 years, advances in medical imaging technology have enabled doctors to diagnose and treat diseases with greater precision than ever before. From X-rays to MRI scans, medical imaging has become an essential tool in modern healthcare, allowing doctors to see inside the human body and detect diseases at an early stage.