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I can't say for sure what species this is. Might be Coreopsis grandiflora. That yellow really pops when the sun hits it.
The cornflower (Centaurea cyanus) is the blue one. It's also known as bachelor button. The red cardinal flower (Lobelia cardinalis) is just starting. It will end up as an irregular flower cluster containing may individual blossoms. I found these two blooming in my back yard, and liked the bright colors of the two together.
A honey bee takes on the enormous job of polinating a Hollow Joe-Pye Weed (Eupatorium fistulosum) in Blue Mound State Park, near Blue Mounds, Wisconsin (USA). Of course, to the bee, it's just lunch.