Posted by jpluimers on 2017/07/07
Good reading on #NoEmailDay 2017: The case of the 500-mile email [WayBack] on how a sysadmin in the mid 1990s found the cause of not being able to send email further than roughly 500 miles.
The exact mile unit doesn’t matter as it was all approximation. Read the FAQ on the 500-mile email [WayBack]
–jeroen
via:
PS: some sendmail tricks from
Posted in *nix, *nix-tools, Fun, Power User, sendmail | Leave a Comment »
Posted by jpluimers on 2017/07/07
Explanation: The hydrogen in your body, present in every molecule of water, came from the Big Bang. There are no other appreciable sources of hydrogen in the universe. The carbon in your body was made by nuclear fusion in the interior of stars, as was the oxygen. Much of the iron in your body was made during supernovas of stars that occurred long ago and far away. The gold in your jewelry was likely made from neutron stars during collisions that may have been visible as short-duration gamma-ray bursts. Elements like phosphorus and copper are present in our bodies in only small amounts but are essential to the functioning of all known life. The featured periodic table is color coded to indicate humanity‘s best guess as to the nuclear origin of all known elements. The sites of nuclear creation of some elements, such as copper, are not really well known and are continuing topics of observational and computational research.
Source: APOD: 2016 January 25 – Where Your Elements Came From
Image rendered from File:Nucleosynthesis periodic table.svg – Wikimedia Commons
–jeroen
via: Where Your Elements Came From Image Credit: Cmglee (Own work) CC BY-SA 3.0 or…
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