Why is it so bad to read data from a database “owned” by a different microservice

I have recently read this excellent article on the microservice architecture: http://www.infoq.com/articles/microservices-intro

Modular Webframework which also includes Frontend modularity

This might be a big or broad question, but I simply cannot find a proper answer to this myself. Right now I’m struggling to find a starting point for the application I’m trying to make.

How to make scalable modules in a div element

I’m interested in creating web modules that are encapsulated by a div element in a manner that, by simply resizing the div, everything in that div scales to the dimensions of that div proportionately (fonts, sub-divs, etc.).

Modular code how do they really fit together?

Let’s say I am developing an ecommerce application. And I have modules organized in certain way.