4 Normal Household Items That Are Secretly Saving The World

3 Car Tires Get A Second Life As Shoes

Old car tires are an environmental blight. They're made up of rubber, oil, chemicals, and the spirit of human tragedy, so you can't really toss them in a landfill and wait for nature to take its course. While scientists have been trying to create greener tires and/or flying cars, Ethiopians awash in spare tires came up with a good solution for the meantime: Make shoes. They've been recycling tire rubber into footwear for decades. And before you say, "Screw that, I'm not wearing hobo tire shoes!" know that this is what they look like:

2 Crime Scene Detectives Can Be Trained With Dollhouses

In the 1940s, detectives weren't exactly crack investigators. Half the episodes of CSI: 1941 would have ended with two confused guys in fedoras and one murderer free to kill again. Improvements came with time, but how were the police supposed to train new and better investigators? Wait for a murder, then shove a bunch of rookies into an active crime scene? That's where Frances Lee, who's been dubbed the mother of forensic science (for her innovative contributions to the field, not her bitchin' cookies and tuck-ins), came into the picture.

Lee grew up with dreams of becoming a nurse or doctor, but her wealthy parents forbid her from going to college because, well, she was a girl. Born in 1878. As a somewhat bitter adult, Lee became interested in forensics, and a detective friend told her about his issues with crime scene contamination and poor police training. Rather than seizing the opportunity to commit the perfect crime, she used her sizable inheritance to establish the first professorship in legal medicine at Harvard University, as well as a library of legal medicine and the country's first forensic pathology program. Lee was well-regarded as an expert in the field she helped formalize, and even went a step further by creating dollhouses for students to train with, since most weren't allowed to take field trips to the local triple homicide.

1 Old Vehicles Are Being Used To Make Artificial Reefs

Generally speaking, giant hunks of metal dumped into the ocean are bad things. And yet everything from decommissioned ships to subway cars, old trucks, and even tanks are being sunk to the bottom of the sea -- not out of callous indifference or spite for Neptune and his pompous ways, but to give them a useful place to spend eternity. See, these metal shells provide hard, reliable surfaces for algae, coral, and invertebrate life to cling to. Then the fish that feed on those invertebrates are attracted to the area, and before you know it, you've got a whole thriving ecosystem based around a light rail car that drunk college students used to pee in.

What makes vehicles ideal are all the nooks and crannies they offer to shelter fish that would otherwise be hunted down and devoured in open waters. You've seen Finding Nemo, you know of this tragedy. Artificial reefs can therefore help restore the populations of struggling species. They're durable and offer great backgrounds for movies about the dramatic reunions of fish parents with their fish children.