Editor’s Note: Call to Earth is a CNN editorial series committed to reporting on the environmental challenges facing our planet, together with the solutions. Rolex’s Perpetual Planet Initiative has ...
Have you ever sat on the bottom of a swimming pool and pondered your watery ceiling? Most of the surface is a sheet of light blue, and you can't see through it, even though the water is clear. But ...
For more than 50 years, scientists theorized that an electromagnetic wave could be reflected temporally—not just spatially.
Fog, twilight, and night create reduced spaces in which shapes, lines, and contrasts are particularly effective. Many of the ...
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What was the mysterious streak of light? Here's what we know about the Southwest sighting
On the night of May 16, a large beam of light resembling a spotlight was seen shooting into the night sky in the Southwest, but its source remains unknown. A Facebook post sharing the mysterious light ...
The speed of light is a fundamental constant, approximately 299,792,458 meters per second. It's the same for all observers and hasn't changed measurably over billions of years. Nothing can travel ...
"The colors of the spectrum, then, "are not Qualifications [alterations] of Light … (as 'tis generally believed), but Original and connate properties." When you purchase through links on our site, we ...
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