Changes

: Good shoes are designed to have a high '''friction''' surface on the sole. Take off one of your shoes and look at the bottom of your show with a [[Magnifying Glass|magnifying glass]].

: *Who has the slipperiest shoes and how do slippery shoes look different from shoes that are not slippery?: *When shoes get older, how does the bottom of the shoes look different and do shoes get more slippery or less slippery as they get old?