The Frontier

The theory of natural selection emerged independently in the 1850s because necessary building blocks like deep geological time (established by Lyell in the 1830s) and global biogeography from colonial voyages were finally in place.

Komisar identifies a serotonin receptor gene linked to neurological sensitivity in babies. Sensitive empathic nurturing in the first three years can neutralize this gene's negative effects.

Men and women have different nurturing hormones - oxytocin makes women sensitive attuners, while vasopressin makes fathers playful stimulators and threat detectors, according to Komisar.

Attachment styles are generationally expressed, not genetically inherited. An insecurely attached mother is likely to raise an insecurely attached child through environmental influence.

The PhenoAge epigenetic clock uses methylation at 500 CpG sites and incorporates clinical biomarkers like albumin and CRP to predict mortality risk.

GrimAge uses methylation at 1,000 CpG sites to estimate levels of plasma proteins linked to aging and smoking exposure, combining them with age and sex to predict time to death.

The DunedinPACE clock uses 173 CpG sites in a longitudinal model trained on the Dunedin cohort to estimate an individual's pace of aging, rather than a static biological age.

Aging clocks are susceptible to both biological noise, like transient inflammation from a workout, and technical measurement noise from sample handling and lab processing.

From an evolutionary perspective, the first-person experience of consciousness is not central to its development, leading to human experiences often being at odds with reality.

Chris Williamson explains that anger's evolutionary purpose is to signal boundary violations and deter future transgressions when formal laws are absent, functioning as an anti-social behavior.

Ecology professor Reinhard maintained a 100-liter barrel of brackish Baltic Sea water, initially from a two-week student experiment, for over six years.

After the Berlin Wall fell in 1989, Reinhard rediscovered the barrel, finding it thriving with diverse microorganisms like phytoplankton, zooplankton, and bacteria.

Reinhard's observation in the barrel challenged ecological theories that predicted ecosystems would stabilize or follow cyclical patterns in isolated conditions.

Over six years, Reinhard found the barrel's ecosystem to be completely chaotic, with species booming, crashing, and shifting dominance, never reaching a stable state.

Reinhard's work, co-authored with Alisa Beninca, was published in *Nature*, prompting skepticism from ecologists who questioned the purpose of restoration if nature is chaotic.

Hendrick Schubert, replicating Reinhard's experiment with eight barrels, found signs of chaos in some, but not all, vessels and compartments, indicating continued uncertainty.

In 1972, Stephen J. Gould, Tom Schopf, Dave Raup, and Dan Simberloff used computers to simulate evolution at random, finding results that mirrored the actual fossil record.

The simulation suggested extinction might be a random process, challenging Darwin's theory that fitness and natural selection are the sole drivers of survival.

Stephen J. Gould saw the computer simulation as a pivotal moment, elevating paleontology's status by posing a new, fundamental question about life's diversity and adaptation.

Matt Kielty notes that 99.9% of all species that have ever existed on Earth have gone extinct, suggesting that extinction is a near-universal fate.

The common 'primordial soup' theory of life's origin largely stems from Stanley Miller's 1952 experiment, which simulated early Earth conditions.

Stanley Miller's experiment, combining early atmosphere gases (ammonia, hydrogen, methane) with 'lightning,' produced amino acids, the building blocks of life.

Professor Nick Lane, an evolutionary biochemist, argues that forming a self-copying cell requires '10 or 12 more steps' beyond amino acids, which Miller's experiment did not explain.

Nobel Prize winner Francis Crick, co-discoverer of DNA, proposed 'directed panspermia,' suggesting alien civilizations seeded Earth with bacterial cells.

Organic molecules, including amino acids and components of DNA, have been found in space and on meteorites, suggesting a cosmic origin for some building blocks of life.

Nick Lane's preferred hypothesis for life's origin is deep-sea hydrothermal vents, which offer necessary chemicals, Earth's heat as energy, and a cell-like structure.

Hydrothermal vents, found 5-6 kilometers deep, form craggy structures up to 60 meters tall that mimic cells, facilitating the spontaneous formation of 'protocells.'