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Model organisms are more than just monkeys and mice Researchers use all kinds of living organisms to learn about life, from monkeys and mice to fruit flies and fungi — even a relative of the mustard family that's celebrating its 200th anniversary. The list is legendary. Model organisms — or research organisms, as they are also known — are living things that scientists, such as biologists, use to study human and other animal or plant life. A model organism can be anything from single-celled bacteria to viruses and fungi. They can be more complex organisms, such as monkeys, mice, rats, fr...

Composting dead pets to grow new life in Colombia This year, companies in the US will begin composting human remains. But a Colombian start-up is already returning deceased pets to the cycle of life. Doris Sanchez visits a small tree planted with the remains of her dog, Lolita, at a memorial garden outside Medellin run by pet composting company Pleia Doris Sanchez brushes fallen leaves from the ground at the foot of a little bush with reddish leaves. Next to it hangs a photo of her beloved beagle, Lolita, who died of a heart attack last year. The plant, a Eugenia, carries more than just�...