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 — blades still catch.

#SkatingHistory #IceScience #Physics #Sports

Not surprisingly, the frozen sidewalks pose a high risk of injury. Of course I had to look for literature supporting my case...

#Norway #ice #icescience