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The world's tiniest creature is difficult to define as it depends on various factors such as size, weight, and existence. However, when considering living organisms, the smallest known animal is the tardigrade (also known as a water bear) which measures about 0.1 mm in length. These microorganisms can survive extreme environments and are found in almost every corner of our planet. On the other hand, if we consider non-living particles, then atoms are considered to be the smallest constituents of matter. Atoms measure approximately 0.1 nanometers in diameter and are composed of even smaller particles such as protons, neutrons, and electrons. Overall, the concept of "tiniest" varies depending on whether we consider living organisms or non-living particles.

The world's tiniest main products include microchips, nanoscale electronic devices, miniature cameras, nano-sized batteries, and tiny sensors.