What is the topic of the lesson? Guess the words in the puzzle

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Across
  1. 4. a productive insight, the act of finding new laws of the material world
  2. 5. A person who is engaged in and has expert knowledge of a science
Down
  1. 1. Systematic knowledge of the material world gained through observation and experimentation.
  2. 2. result of scientific and technical revolution
  3. 3. to create or produce a new original material object
  4. 6. A new device developed from study