It's Eureka moments like these that make for great stories. Two Brit pals play basketball. Elbow of friend meets head of buddy. Ice packs get handed out for injuries. Friend dumps pack in buddy's motorcycle helmet to relieve chilled fingers. Buddy accidentally dons helmet with ice pack inside. And instead of bobbing friend one on chin, exclaims how good it feels. Light bulb goes off as friend conceives of brain-cooling helmet that could save biker lives.