There are 3 research items in my screen shot.

One I am researching, two others which are boosted. One of the boosted has a blue bar (Wheel). Why is it blue?

BOOSTED: Mine a resource

I boosted Bronze working by killing barbarians.
I boosted the Wheel from mining.

Also, I am china and china gets a 60% tech boost on eurekas. I started one turn of bronze working and now the bar is blue same as the wheel.

I decided to research for one turn Masonry but the bar did not go blue.

enter image description here

  • Please circle which one that you mean. Commented Nov 28, 2016 at 10:25
  • I have updated my post.
    – Valamas
    Commented Nov 28, 2016 at 12:45
  • 1
    I came to post the same question about the Civics tree. In my case, I'm positive that I never researched either one, both are boosted, and both look to be exactly 50% complete. Commented Dec 19, 2016 at 3:51
  • Could you have acquired a research boost from a goodie hut (tribal village)?
    – Pahlavan
    Commented Nov 30, 2017 at 6:51

1 Answer 1


In regards to bronze working, the blue semi circle means you have already boosted it. It is to show that the research time is already reduced from the maximum.

The reason why the blue bar at the bottom lights up when selected is to just signify that you are researching a boosted technology (Kinda pointless i know) but there is nothing more to it than that.

Hope this clears things up.

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