8legs: Big think

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#1 out of 2

Experts describe aging as a modifiable biological process measured by phenotypic and epigenetic markers.
Epigenetic clocks use DNA methylation patterns to estimate biological age and predict disease risk.
Researchers suggest slowing aging could reduce multiple age-related diseases rather than targeting one at a time.
Dietary approaches like caloric restriction and modest fasting may mimic aging benefits without extreme limits.
Interventions aim to compress morbidity, extending healthy years rather than simply extending life.
Epigenetic changes may be reversible in cells, raising possibilities for future therapies.
Lifestyle factors such as sleep, stress management, and exercise influence resilience against aging.
Epigenetic clocks may vary by tissue, offering insight into system-specific aging and risk.
The interview underscores a human-centered goal: healthier, longer life with maintained function.

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#2 out of 2

22h ago

The most common gravitational-lensing outcome is a quadruply imaged background source, producing an Einstein cross rather than a ring.
Rings require near-perfect symmetry and alignment; real lenses are not spherical and backgrounds rarely align exactly along the line of sight.
Einstein rings do exist but are rare; the study emphasizes crosses are more common due to lens and source geometry.
Huchra’s lens (G2237+0305) illustrates a four-image Einstein cross formed by a foreground galaxy lensing a background quasar.
Gaia and JWST surveys have expanded the catalog of Einstein crosses, aiding dark matter studies.
The nature of lens mass distribution—ellipticity, substructure, and multiple components—drives cross-shaped appearances.
Crosses often arise when alignment is imperfect and the lens has aspherical substructure, not a perfect sphere.
Partial rings and arcs occur when the lens is near-symmetric or the alignment is nearly perfect but not exact.
Astrophysicists use cross configurations as probes of dark matter substructure within lensing galaxies.
Cosmic lensing discoveries by Hubble and JWST are expanding understanding of the universe and cosmic history.

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