It's impossible to pinpoint the very first scientist. The concept of "scientist" as a specific profession is relatively modern, and the earliest people who engaged in systematic observation and experimentation predate recorded history.

However, we can point to some individuals who are often considered pioneers in scientific thought:

* Thales of Miletus (624-546 BC): Considered the "father of philosophy," Thales was one of the first known individuals to propose explanations for natural phenomena based on rational thought rather than mythology. He is credited with predicting a solar eclipse and making contributions to geometry and astronomy.

* Pythagoras (c. 570-495 BC): Famous for his work on mathematics, specifically the Pythagorean theorem, Pythagoras also made significant contributions to astronomy, music theory, and philosophy.

* Hippocrates (c. 460-370 BC): Known as the "father of medicine," Hippocrates emphasized observation and rational thought in understanding and treating diseases. He is also credited with the Hippocratic Oath, a code of ethics for medical professionals.

* Aristotle (384-322 BC): A prolific philosopher and scientist, Aristotle made significant contributions to logic, physics, biology, and ethics. His work laid the foundation for many later scientific advancements.

It's important to remember that these individuals and others from ancient times did not work in the same way as scientists today. They didn't have the same tools, resources, or methodologies. However, they laid the groundwork for the development of scientific thought and investigation.

Rather than focusing on a single "first scientist," it's more accurate to recognize the gradual evolution of scientific thinking throughout history.