Science brief
Nanoscale Rotors and Skyward Successions
Weizmann researchers build a nanoscale Archimedean motor, while Swift's fiery decay pivots deep-sky astronomy toward Israel's ULTRASAT.
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Weizmann's nanoscale Archimedean screw converts electrical current into controlled physical rotation — opening a practical route to molecular-scale electronics.
BackgroundThe ancient Archimedes' screw lifts liquids along an angled spiral channel to transfer mechanical force with minimal loss. Downscaling mechanical rotation to single molecules has historically stalled against thermal agitation, which overwhelms directional atomic motion.
- Prof. Oren Tal's team suspended a helical helicene molecule between two microscopic gold electrodes, proving that electrical current generates directed mechanical torque.
- Reversing the applied voltage polarity immediately flipped the molecule's rotational direction, demonstrating nanometer-level directional control without external chemical fuels.
- At maximum rotation, the helical spiral boosted electrical conductance 100-fold, opening a direct pathway toward building molecular-scale electronic components and computer logic gates.
- The study, conducted alongside Danish and German academic partners, appeared in Nature after confirming molecular stability at cryogenic operating temperatures.
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The Moghra ape fossil documents hominoid diversification across northern Africa — ending the dogma that modern apes evolved strictly in East Africa.
BackgroundAnthropologists long treated East Africa's Great Rift Valley as the sole cradle where hominoids branched away from ancestral monkey lineages. Early Miocene fossils across North Africa and the Levant remain scarce because intense geological weathering erased vast surface deposits.
- The discovery of Masripithecus moghraensis in Egypt's Moghra formation confirms early primate lineages diversified across northern Afro-Arabian geographic corridors.
- Distinct cranial and dental morphology shows regional adaptations separate from equatorial specimens, documenting an extensive radiation along the prehistoric Mediterranean basin.
- The fossil evidence establishes prehistoric Levantine land bridges as permanent evolutionary habitats rather than temporary transit routes for migrating mammals.
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Swift's uncontrolled burn-up blinds real-time cosmic burst tracking — shifting the global burden of ultraviolet transient surveillance onto Israel's ULTRASAT.
BackgroundLaunched in 2004, the Swift satellite served as astronomy's primary first responder by rapidly pivoting toward high-energy gamma-ray bursts to guide ground observatories. Recent solar storms expanded upper atmospheric density, accelerating orbital decay past what commercial re-boost concepts could overcome.
- During 22 operational years, Swift cataloged over 2,000 gamma-ray bursts and 1,400 supernovae across the ultraviolet and high-energy X-ray sky.
- Space Force tracking models project the 1.5-ton spacecraft will burn up during atmospheric reentry on or near November 6.
- Global astrophysicists are turning to Israel's upcoming ULTRASAT mission, developed by Weizmann and the Israel Space Agency, to restore wide-field ultraviolet monitoring.
Science
Proving that physical DNA volume dictates spindle size during cell division resolves a classic puzzle — providing new screening targets for anti-mitotic cancer therapies.
BackgroundDuring mitosis, spindle fibers align genetic material along the cell equator before pulling matched chromatids apart into twin daughter cells. Mismatched spindle dimensions cause unequal chromosome segregation, a structural defect that triggers aneuploidy and accelerates aggressive tumor growth.
- An analysis across 25 eukaryotic species proved that physical DNA mass directly sets the spatial boundaries of the mitotic spindle assembly.
- The findings settle a century-old biological debate by confirming that cellular machinery measures total nuclear volume rather than counting individual chromosomes.
- Biophysical modeling of spindle scaling gives oncology researchers concrete structural targets for small molecules designed to halt malignant cell proliferation.
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