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Why is pee yellow mystery solved

The enzyme that makes urine yellow has been finally identified. It has been known for more than 125 years that a compound called urobilin is responsible for urine's yellow colour. But it was unclear how exactly it is created from the red-orange bilirubin.

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Are Christmas tree chemicals toxic to humans?

NIST researchers placed a common type of Christmas tree in a sealed chamber for 17 days to monitor and measure the chemicals it emits. These chemicals called volatile organic compounds (VOCs) give that pine smell and can react with ozone to form byproducts. They found low amounts of these chemicals, which may be a potential concern for people who are sensitive to them.