Four Different Challenges: 

1. ML/AI: Machine Learning for Accessibility - Leverage a dataset through machine learning to improve or analyze the accessibility of an application or website
2. Naval Nuclear Laboratory: Electronics - Design and prototype a hardware-based solution that is applicable to real-world Navy operations.
3. Novice 2 Expert Coding: Best Social Good Android App - Create a project with a realistic social impact
4. Embedded Systems Security: Design an HDL VGA controller and dynamically change the image displayed on the monitor.