Causal Loops in Time Travel
About the possibility of time traveling based on several specialized works, including those of Nicholas J. J. Smith (“Time Travel“), William Grey (”Troubles with Time Travel”), Ulrich Meyer (”Explaining causal loops”), Simon Keller and Michael Nelson (”Presentists should believe in … Read More
Gravitational Singularities
Index Academic, Volumul I, 2025 Gravitational singularities in general relativity are spacetime locations where the gravitational field becomes infinite. Scalar invariant curves of spacetime include a measure of matter density. Some physicists and philosophers believe that because the density of … Read More
The future of eugenics
A “free-market” approach to the genetic development of children may result in a homogenizing. Parents may be inclined to choose according to models accepted by society. In this case, improving technologies “will grant racism and homophobia an unprecedented efficacy.” One … Read More
Paradoxes of causal loops in spacetime
There is, among some scientists and philosophers, the idea that any theory that would allow the time travel would introduce causal issues. These types of temporal paradoxes can be avoided by the Novikov self-consistency principle or by a variation in … Read More
The Ontology of General Relativity
General Relativity generated various early philosophical interpretations. His adherents have highlighted the “relativization of inertia” and the concept of simultaneity, Kantians and Neo-Kantians have underlined the approach of certain synthetic “intellectual forms” (especially the principle of general covariance, and logical … Read More
Reptiles – Crocodiles, Alligators, Lizards, Snakes, Turtles
Today there are 6,800 reptile species on earth; the major groups are alligators and crocodiles, turtles, lizards, and snakes. Reptiles are tetrapods and amniotes, animals whose embryos are surrounded by an amniotic membrane. Today they are represented by four surviving … Read More
Drobeta Turnu Severin Heavy Water Plant: Construction
The heavy water plant was established under the name of Combinatul Chimic Drobeta, by Decree 400/16.11.1979, under the Inorganic Products Industrial Center (CIPA) Râmnicu Vâlcea. The thermo-electric plant for supplying the heavy water factory with steam was decided to be … Read More
Fish & Fishing
A detailed guide of everything you want and need to know about fish. A fish is a water-dwelling vertebrate with gills that doesn”t change form, as amphibians do, during its life. Most are cold-blooded, though some (such as some species … Read More
About Dogs
Dog anatomy, breeding, breeds, equipment, health, law, monuments, organizations, related professions and professionals, shows and showing, sports, training and behavior, types, working dogs. Dogs in popular culture, famous dogs, fictional dogs, films. The dog is a canine mammal of the … Read More
Physics Help
The book is an overview of the major subfields and concepts in physics, including a brief outline of the history of physics and its subfields. Physics (from Greek from φυσικός (phusikos): natural, from φύσις (fysis): Nature) is the science of … Read More
Classical theory of singularities
The singularities from the general relativity resulting by solving Einstein’s equations were and still are the subject of many scientific debates: Are there singularities in spacetime, or not? Big Bang was an initial singularity? If singularities exist, what is their … Read More
Hooke’s claim on the law of gravity
Based on Galileo’s experiments, Newton develops the theory of gravity in his first book Philosophiæ Naturalis Principia Mathematica (“Principia“) of 1686. Immediately after, Robert Hooke accused Newton of plagiarism, claiming that he unduly assumed his “notion” of “the rule of … Read More
About Cats
A guide for the cat lovers about the cat behavior, cat attractants, cat breeds, cat health and food, type of cats, cats as pets, fictional cats, films about cats, historical cats. A book full with pictures of the most important … Read More
Newton’s action at a distance – Different views
Different authors have attempted to clarify the aspects of remote action and God’s involvement on the basis of textual investigations, mainly from the Mathematical Principles of Natural Philosophy, Newton’s correspondence with Richard Bentley (1692/93), and Queries that Newton introduced at … Read More
The singularities as ontological limits of the general relativity
The singularities from the general relativity resulting by solving Einstein’s equations were and still are the subject of many scientific debates: Are there singularities in spacetime, or not? Big Bang was an initial singularity? If singularities exist, what is their … Read More
The Birds World
Birds are among the most extensively studied of all animal groups. Hundreds of academic journals and thousands of scientists are devoted to bird research, while amateur enthusiasts (called birdwatchers or, more commonly, birders) probably number in the millions. Birds are … Read More
