Some scientists, futurists and philosophers have theorized about the immortality of the human body, with some suggesting that human immortality may be achievable in the first few decades of the 21st century with the help of certain technologies such as mind uploading (digital immortality). Other advocates believe that life extension is a more achievable goal in the short term, with immortality awaiting further research breakthroughs. The absence of aging would provide humans with biological immortality, but not invulnerability to death by disease or injury. Whether the process of internal immortality is delivered within the upcoming years depends chiefly on research (and in neuron research in the case of internal immortality through an immortalized cell line) in the former view and perhaps is an awaited goal in the latter case.

According to Plutarch, the Athenians preserved the ship that Theseus used to escape, by replacing the parts one by one as they decayed. In its original formulation, the "Ship of Theseus" paradox concerns a debate over whether or not a ship that had all of its components replaced one by one would remain the same ship

In the 1960s a group of researchers examined longitudinal data and found that subtle deficits were often present in patients with psychotic disorders prior to or early in the illness, which were then used to develop the Bonn Scale for the Assessment of Basic Symptoms (BSABS [43–45]). Basic symptoms are considered a core feature of the illness and include subjective experiences of thought, language, perception and motor disturbances; impaired bodily sensations; impaired tolerance to stress; disorders of emotion, thought, energy, concentration and memory; and, disturbances in social functioning [46]. These basic symptoms have since been included in a number of assessment scales designed to identify persons at risk for developing a psychotic disorder (e.g., Comprehensive Assessment of At-Risk Mental States [CAARMS] and Scale of Prodromal Symptoms [SOPS]).

Accounts of behavior, including imitation, often suffer from philosopher's disease: the unnecessary, inappropriate, theoretically driven explanation of behavior in terms of cognition, rationality, and consciousness. Embryos are perversely unphilosophical and unpsychological, starting to move before they receive sensory input. Postnatal contagious yawning and laughing indicate that pseudo-imitative behavior can occur without conscious intent or other higher-order cognitive process.

Vale Tudo initially started as an informal ruleset for fighters from different martial arts to fight each other. The Gracie family was known to organize their famous "Gracie Challenge", where they would fight other martial artists in Vale Tudo bouts to prove the efficiency and superiority of their own Gracie Jiu-Jitsu.[3] Many fighters eventually started to train specifically for Vale Tudo events, mixing striking and grappling, eventually advertising "Vale Tudo" as its own standalone style. For example, Marco Ruas referred to his hybrid style of Luta Livre submission grappling and Muay Thai striking simply as "Vale Tudo".

Vale Tudo initially started as an informal ruleset for fighters from different martial arts to fight each other. The Gracie family was known to organize their famous "Gracie Challenge", where they would fight other martial artists in Vale Tudo bouts to prove the efficiency and superiority of their own Gracie Jiu-Jitsu.[3] Many fighters eventually started to train specifically for Vale Tudo events, mixing striking and grappling, eventually advertising "Vale Tudo" as its own standalone style. For example, Marco Ruas referred to his hybrid style of Luta Livre submission grappling and Muay Thai striking simply as "Vale Tudo".