These bandages, made with chitosan, a substance found in shrimp shells, are up to 30 times more effective in stopping bleeding than other hemostatic bandages. An earlier version was first introduced for military use, and NBA teams soon followed. Now available over the counter, it's overkill for a shaving nick, but a quick fix for nasty on-field cuts. Up next: an implantable version for surgical applications, and a spray or gel that could help bleeding boxers avert an early disqualification.
KytoStat $6 each; kytostat.com