On many evenings during spring and fall migration, tens of millions of birds take flight at sunset and pass over our heads, unseen in the night sky. Though these flights have been recorded for decades by the National Weather ...
Ecology
Aug 28, 2019
0
502
July ended with the hottest recorded average temperature since people have been making daily readings. A huge chunk of Greenland has melted, Arctic seas have opened, and the diversity of life on Earth is threatened.
Environment
Aug 28, 2019
0
26
Can you tell the difference between a young dolphin and an old one? Neither can scientists—not without pulling a tooth, sawing it in half and counting the growth layers like the rings of a tree.
Ecology
Aug 28, 2019
0
235
