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Why are barns red?

I have always wondered why most barns are painted red. It is always an aesthetic sight to see one while driving in the countryside, both during the lush green days of summer, or the yellow arid days of winter. There is of course a chance that farmers chose the color red for its aesthetics value, but I wondered if there was a more practical reason for the choice. An online search produced a bevy of results with equally reasonable choices. One of the sites argues that in the older days, one of the practical methods to seal the barn wood and protect it from the elements was to paint it with a mixture of linseed oil, and  additions of milk and line. The red color would come from adding either the blood of a recent slaughter or from ferrous oxide--rust. As the paint would dry it would turn into a dark red color. I buy the rust theory, since there is a lot of rust to be had everywhere, and the blood theory is a bit weird. The Smithsonian magazine adds a physics...

Stephen Hawking at the Flint Center

I have always enjoyed physics and astrophysics, and the epitome of that enjoyment was attending a live lecture by the famous by Dr Stephen Hawking at the Flint Center yesterday. The event was roughly two hours, divided in three parts. First, Dr Hawking gave a fascinating exposition of black holes and the Hawking radiation, then his long time friend, Prof. Kip Thorne gave an excellent talk about his research on black holes. The sessions ended with a Q&A session dubbed: the best of Hawking. The event was sold out, and the Flint Center was overflowing with patrons standing up on the side to listen to Dr. Hawking. It is not hard to understand why. Dr Hawking is a world renowned physicist who can explain complex topics in simple terms that everyone can understand and enjoy. Because of his deteriorating physical condition due to ALS, most of the lecture and Q&A session were prepared--later on Kip revealed the reason is that the technology that Dr. Hawking uses to communicate all...