* https://danielsopensource.blogspot.com/2018/11/focusing-on-focus.html

* https://danielsopensource.blogspot.com/2018/11/introducing-apollo.html

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* https://github.com/danielbogomazov/apollo/commit/fa1cec8c2db8d4f661caa8a5044dba565db60d7f (+ the commits before)