"What Is and What Should Never Be" is the twentieth episode of the
paranormal drama television series Supernatural's second season, and was
first broadcast on May 3, 2007. Dean Winchester (Jensen Ackles) finds
himself in an alternate reality after a confrontation with a djinn. The
creature appears to have fulfilled Dean's greatest wish: that his mother
had not been killed when he was a child. Dean is happy until it becomes
apparent that his previous work as a hunter of supernatural creatures
has been undone. He then rejects the alternate reality and attempts to
bring himself back. The episode was written by Raelle Tucker, and marked
the directorial debut of series creator Eric Kripke. It featured the
return of deceased characters Mary Winchester (Samantha Smith) and
Jessica Moore (Adrianne Palicki, pictured). Kripke enjoyed expanding
upon the character of Mary, who was only briefly depicted in earlier
episodes. Despite obtaining low ratings, the episode acquired positive
critical reviews, praising Ackles' performance and welcoming the return
of Smith and Palicki. Tucker also received a Constellation Award for her
work on the episode.
Read more:
<https://en.wikipedia.org/wiki/What_Is_and_What_Should_Never_Be_(Supernatural)>
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Today's selected anniversaries:
1791:
The Polish–Lithuanian Constitution of May 3, the oldest
codified national constitution in Europe, was adopted by the Great Sejm.
<https://en.wikipedia.org/wiki/Constitution_of_May_3,_1791>
1855:
American adventurer William Walker and a group of mercenaries
sailed from San Francisco to conquer Nicaragua.
<https://en.wikipedia.org/wiki/William_Walker_(filibuster)>
1939:
Subhas Chandra Bose formed the All India Forward Bloc of the
Indian National Congress in opposition to Gandhi's tactics of
nonviolence.
<https://en.wikipedia.org/wiki/All_India_Forward_Bloc>
1942:
Second World War: Japanese forces began invading Tulagi and
nearby islands in the Solomon Islands, enabling them to threaten and
interdict the supply and communication routes between the United States
and Australia and New Zealand.
<https://en.wikipedia.org/wiki/Invasion_of_Tulagi_(May_1942)>
2000:
The sport of geocaching was born when the coordinates of a
cache outside Portland, Oregon, US, were posted to a Usenet group.
<https://en.wikipedia.org/wiki/Geocaching>
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Wiktionary's word of the day:
treeness:
1. The essence of what it means to be a tree; the qualities that make a
tree what it is.
2. (genetics) The suitability of an evolutionary tree for representing the
structure of a population; the degree to which a population structure
can be accurately described as a tree of descent, with different
branches evolving independently after they split.
3. (graph theory) The condition of being a tree; acyclicity and
connectedness.
<https://en.wiktionary.org/wiki/treeness>
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Wikiquote quote of the day:
 It seems that scientists are often attracted to beautiful
theories in the way that insects are attracted to flowers — not by
logical deduction, but by something like a sense of smell.
--Steven Weinberg
<https://en.wikiquote.org/wiki/Steven_Weinberg>