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! Interest !! Gift Idea !! Explanation
 
! Interest !! Gift Idea !! Explanation
 
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| Engineering || The {{w|International Prototype of the Kilogram|platinum cylinder}} formerly used to define the kilogram || This is an object of historical relevance of which only six exist, making it a very expensive or illegal gift. With the {{w|2019 redefinition of the SI base units|redefinition of the SI base units}} in 2019, {{w|2019_redefinition_of_the_SI_base_units#Kilogram|the kilogram}} is now defined using only natural constants rather than a physical standard. It took some time before this last SI unit was redefined, 3 years prior to this comic's release. The old prototypes are no longer as important as they were when they were actually used to define the kilogram. But they are still historical artifacts with enormous value, even apart from the value of their constituent elements (because they are 10% iridium in weight, about $46 000 per prototype as of 2024-05-29).
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| Engineering || The {{w|International Prototype of the Kilogram|platinum cylinder}} formerly used to define the kilogram || This is an object of historical relevance of which only six exist, making it a very expensive or illegal gift. With the {{w|2019 redefinition of the SI base units|redefinition of the SI base units}} in 2019, {{w|2019_redefinition_of_the_SI_base_units#Kilogram|the kilogram}} is now defined using only natural constants rather than a physical standard. It took some time before this last SI unit was redefined, 3 years prior to this comic's release. The old prototypes are no longer as important as they were when they were actually used to define the kilogram. But they are still historical artifacts with enormous value, even apart from the value of a  kilogram of platinum (about $32 000 at time of writing).
 
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| Biology    || The genomes of the scientists who headed the human genome project || The "International Human Genome Sequencing Consortium," as the {{w|Human Genome Project}} team was known, involved scientists from twenty institutions in six countries. In the US, it was initially led by DNA structure co-discoverer {{w|James Watson}} who was succeeded by {{w|Francis Collins}}. In the UK, the project was led by {{w|John Sulston}}. The teams from other countries' institutions were less prominent and performed substantially less work on the initial sequencing. James Watson's genome was sequenced in 2007. The genome of {{w|Craig Venter}}, the CEO of {{w|Celera Genomics}}, was used as the exemplar for Celera’s sequence. While the “race” between Celera and NIH was declared a tie by then-President Clinton, in actuality, Celera had some 85+% coverage while NIH was about 50%.  
 
| Biology    || The genomes of the scientists who headed the human genome project || The "International Human Genome Sequencing Consortium," as the {{w|Human Genome Project}} team was known, involved scientists from twenty institutions in six countries. In the US, it was initially led by DNA structure co-discoverer {{w|James Watson}} who was succeeded by {{w|Francis Collins}}. In the UK, the project was led by {{w|John Sulston}}. The teams from other countries' institutions were less prominent and performed substantially less work on the initial sequencing. James Watson's genome was sequenced in 2007. The genome of {{w|Craig Venter}}, the CEO of {{w|Celera Genomics}}, was used as the exemplar for Celera’s sequence. While the “race” between Celera and NIH was declared a tie by then-President Clinton, in actuality, Celera had some 85+% coverage while NIH was about 50%.  
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| Psychology  || A nice gift with a note saying you don't expect anything in return || This unkind attempt at psychological manipulation is intended as a joke, and is not a viable option on this list. Unlike normal gift giving, which could induce the Benjamin Franklin effect, causing the gift giver to like the recipient more, explicitly stating that the giver doesn't expect anything is an attempt to manipulate or guilt-trip the recipient (as is common for people with personality disorders) by increasing pressure to reciprocate. The joke here comes from the idea of giving a psychologist a note relating to the psychology of gift-giving, manipulation, and personality disorders, but this would not be to their enjoyment and should not be done in real life.
 
| Psychology  || A nice gift with a note saying you don't expect anything in return || This unkind attempt at psychological manipulation is intended as a joke, and is not a viable option on this list. Unlike normal gift giving, which could induce the Benjamin Franklin effect, causing the gift giver to like the recipient more, explicitly stating that the giver doesn't expect anything is an attempt to manipulate or guilt-trip the recipient (as is common for people with personality disorders) by increasing pressure to reciprocate. The joke here comes from the idea of giving a psychologist a note relating to the psychology of gift-giving, manipulation, and personality disorders, but this would not be to their enjoyment and should not be done in real life.
 
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| (Title text) Babies or literature but not both || Baby shoes || This is a reference to the six-word story {{w|For sale: baby shoes, never worn}}, sometimes falsely attributed to Ernest Hemingway. Someone involved with babies, such as expecting or new parents, would find baby shoes a valuable gift for their child. Someone interested in literature would see the reference to a famous work. But someone who understands the reference and also enjoys babies might be sad, since the story implies the seller was expecting a baby but something went tragically wrong. This story was previously the subject of [[1540: Hemingway]].
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| (Title text) Babies or literature but not both || Baby shoes || This is a reference to the six-word story {{w|For sale: baby shoes, never worn}}, sometimes falsely attributed to Ernest Hemingway. Someone involved with babies, such as expecting or new parents, would find baby shoes a valuable gift for their child. Someone interested in literature would see the reference to a famous work. But someone who understands the reference and also enjoys babies might be sad, since the story implies the seller was expecting a baby but something went tragically wrong.
 
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