This document summarizes a presentation on micro-credentials given by Professor Mark Brown of Dublin City University. It discusses: 1. Sketching the global landscape of micro-credentials offered by universities, employers, and MOOC providers. 2. Outlining different business models such as sole institution models and partnerships. 3. Identifying gaps between the state of research and reality regarding benefits, demand, and supply of micro-credentials. It calls for more data on outcomes. The presentation concludes by acknowledging the challenges in mixing traditional credentials with new micro-credentials, but suggests this could be achieved through innovative approaches, as with the invention of mayonnaise allowing oil and water to mix.