Not surprisingly, the frozen sidewalks pose a high risk of injury. Of course I had to look for literature supporting my case...
Skating began on frozen ponds, lakes, and rivers, yet today it is often confined to indoor rinks.
Natural ice is never perfectly smooth: breeze, waves, air bubbles, or snow create impurities.
Even scraping and squeegeeing can't fully match rink ice β blades still catch.
