Environmental variability and migration promote the evolution of cooperation among humans: A simulation-based analysis
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Updates every hour. Last Updated: 22-Dec-2025 09:11 ET (22-Dec-2025 14:11 GMT/UTC)
For 10 months, a SETI Institute–led team watched pulsar PSR J0332+5434 (also called B0329+54) to study how its radio signal "twinkles" as it passes through gas between the star and Earth. The team used the Allen Telescope Array (ATA) to take measurements between 900 and 1956 MHz and observed slow, significant changes in the twinkling pattern, or scintillation, over time.
Pulsars are spinning remnants of massive stars that emit flashes of radio waves, a type of light, in very precise and regular rhythms. Due to their high rotation speed and incredible density. Scientists can use sensitive radio telescopes to measure the exact times at which pulses arrive in the search for patterns that can indicate phenomena such as low-frequency gravitational waves. However, gas in interstellar space can scatter a pulsar’s radio waves—spreading them out and slightly delaying when each pulse is received. Understanding and correcting these tiny, changing delays, which can be as small as tens of nanoseconds (a nanosecond is one-billionth of a second), helps keep pulsar timing as precise as possible.
Just as starlight “twinkles” in Earth’s atmosphere, pulsar radio waves also “twinkle”, or scintillate, in space. As the signal travels through clouds of electrons between the pulsar and Earth, it creates bright and dim patches across radio frequencies. These patterns aren’t static; they evolve as the pulsar, the gas, and Earth move relative to each other. This twinkling delays the pulses, and the amount of scintillation matches the extent of the delay. By frequently monitoring a single bright, nearby pulsar, the team observed these patterns shift and translated them into tiny timing delays. These methods can then correct the delays that matter for the most precise pulsar experiments.
Researchers from Konstanz and Jülich realize tunable “swarmalators” – particles that both move in space and synchronize in time like living organisms
A team of researchers from the University of Zurich and the NCCR PlanetS is challenging our understanding of the Solar System planets interior. The composition of Uranus and Neptune, the two outer most planets, might be more rocky and less icy than previously thought.
When you’re swaying in a beachside hammock on a lazy summer day, take a moment to thank the Indigenous cultures that invented it.
Native to South America and the Caribbean, hammocks were traditionally woven by women, who were frequently fiber-workers in Indigenous cultures, said Binghamton University Associate Professor of English John Kuhn, who recently co-authored an article on the topic.
“The oldest preserved specimen is 4,000 years old, but they may actually be much older,” said Kuhn, who also directs the Institute for Advanced Studies in the Humanities at Binghamton. “We just don’t know; textiles don’t preserve well in the tropics.”
Co-authored by Marcy Norton at the University of Pennsylvania, “Towards a history of the hammock: An Indigenous technology in the Atlantic world” recently appeared in postmedieval: a journal of medieval cultural studies.
Portable, versatile and easy to clean, hammocks are a comfortable way to sleep in a hot climate. They also protect the user from insects, especially when compared to the ground-based bedding common to European colonizers.
“Colonists basically adopt them right from the jump,” Kuhn said. “They learn to use them because the hammock was a major component in hospitality rituals that are being extended to them by Indigenous groups who are seeking alliance and friendship.”
The technology proved useful for military expeditions in the Americas and was adopted by figures such as English explorer Sir Walter Raleigh. As colonial settlements began to develop, their use was adopted by a wider population, from elites to slaves.
Hammocks are also connected to Indigenous culture with deep webs of meaning. In addition to sleep, the bed-slings were used as private spaces to chat, manufacture objects or play music. In short, they were a way to define an individual’s personal space in an otherwise communal culture.
“We know from one Kalinago-French dictionary compiled in the early colonial period that the word for hammock was linguistically linked to the word for placenta,” Kuhn said. “It’s kind of poetic: You’re in one kind of container and then, because hammocks are given to babies right away, you move to another one after you’re born.”
Not only did individuals enter the world in a hammock, they left it in one, too; hammocks were also used as burial shrouds. They even played a role in religious life, as a vessel for healing rituals and trance states in which shamans would commune with spirits.
The spread of hammock use among colonizers belies the common belief that European technology was far superior to that of Indigenous people. It’s far from the only example of cultural borrowing; take chocolate and tobacco, which originated as stimulants developed by Indigenous cultures.
Kuhn is currently working on a book about another Indigenous technology: birchbark canoes, which North American colonists immediately adopted for their own use.
“Sometimes people have this idea that Indigenous cultures were just destroyed, and they aren’t necessarily seen as huge technological contributors to the Atlantic world that emerges out of colonization,” Kuhn said. “The next time you see a hammock, just take a minute to marvel at the ingenuity of the cultures that it sprang from!”
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