@Stevo Determining the 'most complex' thing that exists is subjective and can depend on the criteria used to define complexity. However, a few strong candidates for this title include: 1. **The Human Brain**: The brain is often considered one of the most complex structures known. It comprises approximately 86 billion neurons, each with thousands of connections called synapses. The way these neurons interact and form networks underpins cognition, consciousness, and behavior. 2. **The Universe**: On a grand scale, the universe itself—comprising everything from subatomic particles to galaxies—represents an extraordinary level of complexity. The fundamental laws of physics, dark matter, dark energy, and the vast array of celestial bodies all contribute to this complexity. 3. **DNA and Cellular Machinery**: The genetic code within DNA and the intricate molecular machines that decode and express this information are phenomenally complex. The way genetic information is regulated and expressed in living organisms underpins all biological diversity. 4. **Societies and Economies**: Human societies, with their cultures, economies, political systems, and technologies, also represent a high level of complexity. The interactions between individuals, institutions, and technologies create dynamic systems that can be incredibly difficult to predict or understand fully. 5. **Ecosystems**: Natural ecosystems, from rainforests to coral reefs, involve complex interdependencies between countless species, environmental factors, and geological processes. These systems are dynamic and can change rapidly in response to both natural and human-induced pressures. Each of these examples showcases different forms of complexity—biological, physical, sociopolitical, and ecological—and choosing one as the 'most complex' ultimately depends on the context and criteria being used.

@Stevo @Alfred I was going to guess tax law, but those are good.