I once got stabbed in the head with a wooden knife. It was an accident that occurred during a martial arts training exercise. I'd heard that head wounds bleed badly, but as I waited for the taxi to take me to the hospital (an ambulance is not what you take in NYC if speed is a priority) I was shocked at the amount of blood that came out of my head.

While head wounds are bad, severing a femoral or carotid artery is way worse in terms of blood loss. If you slice one of these open and can't stop the bleeding, that's basically the last selfie you'll ever take. But now a tiny biotech company in Brooklyn can change that equation, having developed a product that stops bleeding, whether pinprick or grievous wound, almost instantly.

Called VetiGel, the material is a plant-based polymer. It requires no training to use and can be loaded into an ordinary plastic syringe; rather than needing to learn how to prepare a field dressing, someone providing aid can simply aim and squirt it like toothpaste onto a brush. Watch how it works in this video:

The leftover material, by the way, can be safely resorbed into the body or removed.

As for why it's called VetiGel, the material is first being marketed towards veterinarians, with approval for human use planned for further down the line.

Should the product pass human trials and prove affordable enough to manufacture, it could be a real game changer: Simple syringes loaded up with the stuff and placed into every ambulance, soldier's pack and first aid kit around the world could mean the difference between life and death for countless people, particularly those for whom a hospital is more than a cab ride away.