As payment methods have evolved from the traditional cash-based system to mobile systems, contactless cards are becoming more popular for their convenience and flexibility. Here's a primer on how this mobile payment system stores your card information, as well as the near-field communication technology behind it.

From navigating unfamiliar terrain and dangerous weather conditions to working in risky situations, AI could be of enormous aid to first responders and the military if AI systems could react appropriately when something significant and unexpected occurs, without needing to be retrained on a large data set.

People all over the world can connect, ask questions, and share knowledge in real time in specialized Slack communities, including in niche channels for specific topics. Of course, there are a wealth of technology- and software-related Slack workspaces out there. Here are five communities that stand out.