Name a feature that promotes user retention on LifeX.

The ability to revisit and retake practice questions over time is a significant feature that promotes user retention on LifeX. This capability allows users to reinforce their learning by providing opportunities for spaced repetition, which is a proven method for enhancing memory and understanding. When learners can go back to questions they have previously encountered, they can assess their progress and fill in knowledge gaps, which consequently boosts their confidence and engagement with the platform.

Having the option to retake questions also allows users to practice at their own pace, catering to different learning styles and preferences. This flexibility can lead to a more personalized learning experience, encouraging users to spend more time on the platform, ultimately fostering a habit of consistent learning and study.

The other options, while valuable, may not have the same direct impact on retention as the ability to engage with practice questions repeatedly over time. Daily motivational quotes can inspire users but may lack the interactive element that facilitates deeper learning. Access to exclusive study groups can enhance collaboration, but if users don’t feel confident in their knowledge, they might not engage as fully. A points system for rewards may incentivize usage, but it does not inherently guarantee that users are retaining knowledge or improving their skills.