Retail is dieing.

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Buffett’s been paring his stake in Walmart since. He first bought shares in Walmart in 2005.

He said Amazon’s competitors, “including us in a few areas, have not figured the way to either participate in it, or to counter it.”

Since the end of 2014, Walmart shares have fallen 21% compared with a 119% jump in Amazon.

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In Brief:

Researchers found out that human eyes can detect single photons when in the dark. Human eyes become more sensitive when subjected to darkness, making our eyes capable of doing a task that even high-tech machines struggle to perform.

Researchers from Rockefeller University and the University of Vienna recently discovered that human eyes can detect even the smallest units of light, called photons, under super-dark conditions. This is the first time that experts were able to show this capability of the human eye.

The Russian spy ship, the SSV-175 Viktor Leonov, is sailing in international waters off Delaware, a U.S. defense official says.

One of the most historically resonant sites in Germany’s capital has been left in ruins.

A National Academies report on development of hypersonic weaponry indicates the U.S. may be losing its leadership to key adversaries.