Scientists are exploring the creation of robotic arms, legs, and even extra thumbs to expand the natural abilities of the human body. These are called supernumerary robotic limbs (SRLs), and their goal is not to replace lost body parts but to enhance human performance beyond normal limits. Unlike traditional prosthetics, which restore lost functions, SRLs add new capabilities, offering users the potential to perform more tasks simultaneously or with greater precision. These artificial limbs are made from a combination of rigid materials, motors, and actuators, and are usually worn like a backpack or a watch. They are typically controlled by another part of the body—often the foot—where sensors translate movements into robotic actions. Some studies have even looked into using the muscles around the ears as a control mechanism, showing the variety of ways these devices can be operated. While controlling robotic limbs through brain signals has been studied, it has proven challenging due to the complexity of the technology and the long time needed for users to train and calibrate the system. However, recent research shows that people can learn to control an extra arm or a sixth finger in less than an hour. This is largely due to the use of vibrating motors and electrodes, which provide immediate feedback and help users adapt quickly. Despite their potential, current SRLs are often heavy and cumbersome, and their speed is limited to ensure user safety. However, studies show that the brain can adapt to these new limbs over time, making their use feel more natural. This adaptability opens up a wide range of applications, including manufacturing, healthcare, space exploration, music, arts, gaming, and rehabilitation. For instance, a surgeon might use four tools at once, or a rescue worker could both lift debris and extract a victim during a disaster. Researchers have already developed robotic limbs that resemble fictional examples, such as the four-armed Doctor Octopus from Marvel comics. One notable example is the Third Thumb, an additional finger created by body augmentation designer Dani Clode in collaboration with the University of Cambridge. These innovations are still in the experimental phase, but they hint at a future where humans may have the ability to perform tasks that were once thought impossible.