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Small tree finch
Living World

Darwin’s finches fall prey to a blood-sucking parasite

An invasive fly could mean the loss of bird species on the Galápagos Islands. To save them, scientists may introduce another invasive insect.

Mouse-rat chimera
Health & Disease

Organs grown to order

Genetic advances may make it possible to grow transplantable tissues in other species. That could solve immunity and availability issues, but raises ethical concerns.

Human liver cells showing signs of fatty liver disease
Health & Disease

An invisible liver disease balloons into view

Fat buildup in the body’s filter organ can lead to scarring and worse. In step with obesity and diabetes, incidence is on the rise and a race for a cure is on.

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