Alex Xiong

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White sky at night not a city bird's delight

A study published today in the journal <i>Biology Letters</i> reports that free-living urban songbirds have increased levels of the stress hormone, corticosterone, in their bloodstream when they nest under street lights. Higher corticosterone concentrations raises the likelihood that birds will prematurely …

Birds

Camera-Trap Photos Reveal Secret Lives of Mammals

From a minute mouse to giant anteaters and the enormous elephant, camera-trap photos are revealing the secret lives of mammals, with the first such …

The Biggest Barrier to Wealth Is Your Self-Limiting Beliefs

Opinions expressed by <i>Entrepreneur</i> contributors are their own.<p>I’ve made millions by trading penny stocks and teaching my students how to do the same, but what a lot of people don’t know about me is that I was a philosophy major in college. My career has obviously taken me in a different direction, …

Twin Jet Nebula spreads its wings in new Hubble photo

Twin shells of colorful gas shoot into space 2,000 light-years from Earth in a newly-released photo taken by the Hubble Space Telescope.<p>The colorful …

Universe

15 birds with spectacularly fancy tail feathers

These bird species take shaking your tail feathers to a new level.<p>Birds come in a breathtaking number of shapes, sizes and colors, but some really …