27/09/2017

Collapsed Mexico school raises questions about quake codes

On paper at least, the Mexico City school appeared to be structurally sound and built to withstand a major earthquake. But it collapsed, killing 26 people, most of them children. And now authorities are looking into whether ...

A first look at geographic variation in Gentoo penguin calls

Vocal communication is central to the lives of many birds, which use sound to attract mates and defend territories. Penguins are no exception, but we know little about how or why penguin vocalizations vary geographically ...

Caribbean praying mantises have ancient African origin

Three seemingly unrelated praying mantis groups inhabiting Cuba and the rest of the Greater Antilles actually share an ancient African ancestor and possibly form the oldest endemic animal lineage on the Caribbean islands, ...

A beautiful wing design solution inspired by owl feathers

Many species of owl are able to hunt without being heard by their prey by suppressing the noise of their wings at sound frequencies above 1.6 kilohertz (kHz)—including the range at which human hearing is most sensitive.

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