Not very attractive graphics but it conveys the message. Change voltage/pressure from low to high to see the difference.

http://faraday.physics.utoronto.ca/IYearLab/Intros/DCI/Flash/WaterAnalogy.html

Google's decision to leave China was a bad news for chinese scientists.

One of them mentioned that "research without Google really is like life without electricity. You can go on without it, but you can’t thrive. You can’t even compete."