Gray whales have been veering off their normal routes along the West Coast and swimming under the Golden Gate Bridge into San Francisco Bay in unprecedented numbers.
Plants & Animals
Jun 25, 2024
0
66
In a study published in Nature Communications, collaborating physicists from Singapore and the UK have reported an optical analog of the Kármán vortex street (KVS). This optical KVS pulse reveals fascinating parallels between ...
Optics & Photonics
Jun 13, 2024
0
353
There's a longstanding debate simmering among biologists who study porcupines. There are 16 porcupine species in Central and South America, but only one in the United States and Canada. DNA evidence suggests North America's ...
Evolution
May 28, 2024
0
94
Why are fossils of duckbill dinosaurs, a North American family, found in North Africa?
Paleontology & Fossils
Mar 22, 2024
0
79
The galaxy NGC 5427 shines in this new NASA Hubble Space Telescope image. It's part of the galaxy pair Arp 271, and its companion NGC 5426 is located below this galaxy and outside of this image's frame. However, the effects ...
Astronomy
Jan 31, 2024
0
2
Plant biologists report that a species of tree fern found only in Panama reanimates its own dead leaf fronds, converting them into root structures that feed the mother plant. The fern, Cyathea rojasiana, reconfigures these ...
Plants & Animals
Jan 29, 2024
0
2
White streaks of bird waste paint the steel trusses beneath the Astoria-Megler Bridge over the Columbia River. Every flat surface and hidey-hole of this bridge is stuffed and stippled with nests. Black birds roost on the ...
Plants & Animals
Jan 22, 2024
0
73
One of the hottest debates in archaeology is how and when humans first arrived in North America. Archaeologists have traditionally argued that people walked through an ice-free corridor that briefly opened between ice sheets ...
Archaeology
Dec 16, 2023
1
1232
Takahē are a striking bird and a national treasure in Aotearoa New Zealand. But the history and origin story of this flightless swamp hen have become a point of scientific debate.
Evolution
Dec 5, 2023
0
18
Forming a land bridge between Asia, Europe and Africa, the Arabian Desert hosts a distinctive wildlife community adapted to extreme conditions. Many of the rare, threatened and endemic species inhabiting this region have ...
A bridge is a structure built to span a valley, road, railroad track, river, body of water, or any other physical obstacle, for the purpose of providing passage over the obstacle. Designs of bridges will vary depending on the function of the bridge and the nature of the terrain where the bridge is to be constructed.
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