The source is a transcript from a YouTube video featuring Jeff Dean, the Chief Scientist of Google DeepMind and Google Research, who discusses important trends and advancements in Artificial Intelligence (AI) over the past 15 to 50 years. Dean details his early work on neural networks and the origins of Google Brain, highlighting key technological breakthroughs like MapReduce, BigTable, and the development of TensorFlow. A significant portion of the discussion focuses on the impact of deep learning, increased computational scale (via TPUs), and architectural improvements like the Transformer model. Finally, Dean presents recent progress with the Gemini 3.0 Pro multimodal model, emphasizing its advanced capabilities in areas such as mathematical reasoning and complex coding applications.