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5. Psilocybin temporarily dissolves brain networks
The psychedelic drug psilocybin briefly erases people’s neural fingerprints, the baseline brain activity unique to an individual. Some of the biggest changes occur in an area called the default mode network, which may play a role in creating a sense of self. Most of the drug’s effects typically go away within a day. A better understanding of psilocybin could lead to better mental health treatments (SN: 8/10/24, p. 12).
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4. Social media harms teens’ mental health, mounting evidence shows. What now?
While evidence grows for the harmful effects of social media on adolescent mental health, more rigorous research is needed to examine the mechanisms behind this potential causal link and why certain groups are more at risk of harm. Only then can policy makers, health professionals, parents and other adults help safeguard young people online (SN: 3/9/24, p. 14).
Most teens use social media, often for hours on end. Some social scientists are confident that such use is harming their mental health. Now they want to pinpoint what explains the link.Carol Yepes/Getty Images
3. Why the 2024 total solar eclipse will be such a big deal
The April 8 solar eclipse visible over North America was extraordinary, even by solar eclipse standards. The moon was at a point in its orbit that brought it quite close to Earth. The sun was also close to its peak activity, known as solar maximum. This confluence of factors gave spectators an especially dark and long eclipse and scientists an exciting opportunity to study the sun (SN: 3/9/24, p. 24).
The sun’s corona is on full display in this composition of 161 photographs taken from Mitchell, Ore., during the August 21, 2017, solar eclipse. Miloslav Druckmüller, Peter Aniol, Shadia Habbal/NASA Goddard, Joy Ng
2. Geoscientists found the most dangerous part of a famous West Coast fault
Seismic data reveal that the Cascadia megathrust, a massive fault in the Pacific Northwest, is not a single, continuous fracture, but rather composed of at least four segments. The most dangerous segment appears to stretch from off the coast of southern Vancouver Island through the state of Washington (SN: 7/13/24 & 7/27/24, p. 6).
The stumps of the Neskowin Ghost Forest in Oregon are the remains of an ancient spruce forest that was suddenly lowered and buried by a Cascadia mega-earthquake. The stumps of the ghost forest, shown protruding from the sand here, have been estimated to be more than 2,000 years old.Rob DeGraff/Flickr (CC BY-NC-ND 2.0)
1. DNA from old hair helps confirm the macabre diet of two 19th century lions
Genetic analysis of old hair stuck in the maws of two famed lions reveal the beasts’ diet. Dubbed the “man-eaters of Tsavo,” the lions roamed Kenya more than a century ago, snacking on giraffe, oryx, zebra, waterbuck, wildebeest and, yes, humans. The method of analysis could help scientists re-create the dining habits of other long-dead predators (SN: 10/11/24).
The taxidermied Tsavo lions (shown) are on display at the Field Museum of Natural History in Chicago. The two male lions were responsible for many deaths during the late 1890s.Jeffrey Jung (CC BY-SA 3.0)
Top TikTok
Not only was news about the psychedelic drug psilocybin among our most-read stories of the year, it also topped TikTok. In our most popular video, Science News Explores assistant managing editor Maria Temming explains that a high dose of the drug can temporarily scramble a person’s unique default brain activity.
