High heels can be notoriously difficult to walk in, but Hillary Clinton has an ingenious trick. While speaking onstage today at the Clinton Global Initiative meeting in San Juan, Puerto Rico, the former first lady wore a pair of black pumps with anti-slip pads pasted to the bottom. Apart from the shoes, Clinton wore one of her signature pantsuits, choosing a dark color with a matching shell underneath. Her footwear was a pair of black pumps with a pointed toe and kitten heel. The shoes appeared to have a smooth sole, which can lead to slippage on wet floors and...