Nanotechnology involves manipulating matter at the molecular scale of 1 to 100 nanometers. It has been used to improve sports equipment and apparel by making them lighter yet stronger, longer lasting, and more hydrodynamic. For example, nanotechnology allows for golf clubs that are lighter but have a larger sweet spot, tennis balls that last longer, and swimming suits that are more streamlined in water. However, its use in sports comes with some concerns, as it can be expensive, create unfair advantages, and potentially focus more on science than athletic ability or skill. There are also concerns about any health risks related to cancer.