1) The word "yesterday" contains three vowels: E, A, and A.

2) The development of the World Wide Web Consortium (W3C) and web standards has ensured interoperability and compatibility across different web browsers and devices.

3) The increasing emphasis on mental health and well-being has led to greater awareness, advocacy, and destigmatization of mental health issues, as well as efforts to improve access to mental health services and support systems.

4) The concept of self-driving cars, or autonomous vehicles, is being actively developed by companies such as Tesla, Google (Waymo), and Uber.