Scientists report that memory can persist in mice despite massive loss of hippocampal synapses during induced artificial hibernation, challenging the idea that strong, stable synaptic connections are solely responsible for memory storage.

Following awakening, about 82% of dendritic spines that had vanished regrew in their original positions as temperature normalized, indicating structural recovery of memory-related circuits.

Dense clusters of synapses survived the hibernation, while dispersed ones did not; in contrast, a drug-treated control group destroyed even clustered synapses, highlighting the protective role of core synapses for memory retention and recovery.

The piece is a roundup of multiple science stories with several distinct findings suitable for summary, not a single narrative.

Overall, the article highlights interdisciplinary advances across climate history, animal behavior, memory biology, and deep-time evolution, with a playful tone and references to the author’s broader work.

Published in Science on the 13th of the month, the study offers a new framework for understanding memory storage and resilience under extreme physiological conditions.

In mammalian evolution, a neonatal line in the cynodont Chiniquodon theotonicus suggests viviparity dates back to the late Triassic, pushing the origin of mammalian birth to at least 236 million years ago.

In amphibian behavior, female Cope's gray treefrogs defer mate choice as the number of calling males increases, showing choice overload effects on decision-making in noisy environments.

The study discusses the intriguing possibility of translating artificial hibernation insights to human health and neuroscience, while acknowledging questions about causality and the protection of core clusters over time.

Historic European floods (1342–1343) were part of a larger sequence of major floods reconstructed from contemporary sources; local memorials shaped long-term risk awareness, and researchers warn such extreme sequences may recur.

A Science study by Okinawa Institute of Science and Technology and collaborators argues long-term memory relies on engram synapse architecture rather than universal strengthening of all synapses.

Findings come from a mouse model of artificial hibernation using brain imaging, structural analysis, and behavioral tests, reported in Science with DOI 10.1126/science.aee7004.