October 2021 - Vol. 64 No. 10
![October 2021 CACM cover](https://cacm.acm.org/wp-content/uploads/2021/10/October2021.500x669.jpg?w=500)
Features
New Life for Cordless Communication, Old Regrets for Software Projects
Section 230 and a Tragedy of the Commons
Broadening Participation by Teaching Accessibility
Remaining Connected Throughout Design
Competitive Compatibility: Let's Fix the Internet, Not the Tech Giants
Software Development in Disruptive Times
Human Detection of Machine-Manipulated Media
The Role of Professional Certifications in Computer Occupations
Technical Perspective: Liquid Testing Using Built-in Phone Sensors
Liquid Testing with Your Smartphone
Technical Perspective: The Real-World Dilemma of Security and Privacy by Design
Securing the Wireless Emergency Alerts System