Achilles' heel. Emperor Palpatine's overconfidence. Everest's South Col. We all have our weaknesses. Even waterproof jackets, rain pants and tents can be breached, particularly where their weaknesses ...

You’ve probably been there: You’re hiking through a surprise fall rainstorm when you realize that the jacket you’re wearing is leaking along the seams. Minutes later, you’re soaked, and the layer you ...