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Actually bike lanes work best if 1. They are completely separate from the road or 2. The road feels narrow so cars naturally slow down. So go right ahead and spray paint bike lanes on the edges of narrow roads. I am sure that on 99 percent of US roads in town/city centers it will improve safety for cyclists, drivers and pedestrians.
Not sure about that. For high school math it is still quite important that students are familiar with circles and angles on circles. Analogue clocks are a gentle introduction to this.