Estates are things you own when you're alive that are distributed out to your beneficiaries when you pass on.
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Survival of the fittest is at one time the peak of scientific theories and a hype in intellectual discussions. It has proven its worth and taken pretty seriously up till this day. Simple enough, the genes that ensure your survivability will be passed on precisely because it survives.
But how relevant exactly is it in today's context? I'm not challenging Darwinism; I'm merely counter-proposing a change that comes along with age in all aspects of beings...
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Because information and social interaction has transformed so much since Charles Darwin's age, we have to factor in the very critical influencing role our society is playing now. The society is now very much like a national/international bank where everyone can deposit all the ideas/cultures/norms/beliefs/behaviors which can eventually be passed on to the next generation (much like what genes do, except perhaps even more efficiently since it's a continuum of transitions and it ever-exist versus the one-off event of child birth), and the account we're holding in this bank is publicly accessible. Transferring of behavioral determinants are no longer done through natural reproduction but adaptation to environment and extraction of social norms; the pin to the genetic bank is no longer sperms and eggs or proteins with X and Y chromosomes but societal interactions and digital information. It's like what we have to survive is all coded on a cheat sheet and published on the Internet, and the "examination" system of rDNA and DNA is being sidelined.
What I'm trying to say is: what we are born with genetically is losing their effect on our eventual beings as societal influences erode off that importance to bring the whole survivability-game to a whole new playing field. Think about it, the Intelligence that we once hold so dearly of is now taking a secondary role to the Emotional Quotient we deemed of higher priority in the present context. The need of strength to hunt for a game is now traded for social skills and ability to do business, and there is no one "sure-kill" skill that can really ensure your survival in this capitalistic world we are living in today. So what is the use of DNAs and the point in passing them on genetically (albeit for physical characteristics so that your parents can be sure you are not an alien)? Isn't all these "needs" more accessible and useful if we were to extract them from the idea bank in our society? Isn't the "legacy" we leave behind in the form of culture and societal norms more valuable than our biological estates?..
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How do gays and lesbians come about generations after generations? Who wanna bet it on the works of genes?