Researchers have analyzed 11 harbors in the Mediterranean basin where, in many cases, 2,000-year-old (and sometimes older) headwaters constructed out of Roman concrete stand perfectly intact despite constant pounding by the sea. The most common blend of modern concrete, known as Portland cement, a formulation in use for nearly 200 years, can’t come close to matching that track record. In seawater, it has a service life of less than 50 years. After that, it begins to erode.
The secret to Roman concrete lies in its unique mineral formulation and production technique. As the researchers explain in a press release outlining their findings, “The Romans made concrete by mixing lime and volcanic rock. For underwater structures, lime and volcanic ash were mixed to form mortar, and this mortar and volcanic tuff were packed into wooden forms. The seawater instantly triggered a hot chemical reaction. The lime was hydrated—incorporating water molecules into its structure—and reacted with the ash to cement the whole mixture together.”
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Moving the family to OSX however did. That was 3 years ago and there has not been a single tech support issue since then.
The question is whether this is because they have no problems, or because they're reluctant to call the person who inflicted OSX on them.
I totally agree. My father decided to get a iMac. I thought great then I have to keep explaining, finding software and the NAS never worked correctly ! Personally I'm grateful after 7 long years to get him back on Windows 7.