Not all poisonous gases have a smell or a color. But a tiny grid of pastel- and candy-colored squares that effectively "sniffs" out hazardous chemicals in the air such as chlorosarin—a highly toxic ...

Researchers have demonstrated that the sensor changes color in specific patterns in response to chemical vapors, producing ...

Old milk jugs and pool noodles are standard materials for repurposing, but check out what you can do with items like books and gutters.