The Comet Newsletter's second issue covers the latest developments in machine learning (ML) from Google I/O 2021, including Google's advancements in speech and image technology, ML privacy on Android, and the introduction of Vertex AI, a new platform for cloud-based ML model development. Additionally, it discusses Twitter's decision to discontinue its image cropping algorithm due to bias concerns, highlighting the importance of addressing potential impacts of ML models. The newsletter also features a podcast episode about CodeCarbon, a Python library for calculating and visualizing ML code's carbon footprint, recognizing the importance of environmental considerations in ML. Furthermore, it includes insights on the human-centered approach to Explainable AI by Upol Ehsan, emphasizing the collaborative nature of understanding and creating AI systems.