I was not able to find anything properly proving that proper tooth brushing cannot be achieved with a normal toothbrush. Dentists usually should tell you if you are brushing too hard or missing spots. If you follow this advice, the same amount of cleaning can be achieved without spending as much as you need to for an electric toothbrush.
And for the issue of brushing too short or too long. A toothbrush telling you is not better than just setting a timer but way more expensive…
It is just something needed for synching calendar and contact information between KDE services, if you have no application that does this, akonadi is not started in the first place… The calendar events in the default panel clock is one of these and can be disabled in its settings as another commenter mentioned
Major effects of climate change happened post-2006
Not really that much difference if you brush correctly
Transport Fever 3 might do some of this stuff. The pedestrians and traffic were quite good in Transport Fever 2 but that one had the train issue you talked about
With questions you imply something, so every question is a statement to an extent