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An extended period of turmoil in the prehistoric Maya city of Mayapan, in the Yucatan region of Mexico, was marked by population declines, political rivalries and civil conflict. Between 1441 and 1461 CE the strife reached an unfortunate crescendo -- the complete institutional collapse and abandonment of the city. This all occurred during a protracted drought.

A new study found that rates of cannabis use and daily cannabis use have increased across the U.S., and current cannabis use and daily use are substantially higher among individuals residing in states that have legalized recreational cannabis use. Rates of cannabis use are even higher among Americans 12 and older who smoke cigarettes, and who reside in states with recreational cannabis laws, compared to those who live in states where cannabis was illegal in 2017.

Researchers used a new kind of computational tool to parse the complicated genetics that put some people at higher risk of becoming addicted to alcohol, cigarettes, and likely other substances.

When it comes to keeping time, an unassuming species of songbird is on a par with professional musicians, according to new research.

A cool pocket climate around the snout of a glacier could help researchers predict how forests will respond to fast climate change, according to the authors of a new case study of a rapidly advancing and retreating glacier in Alaska.

Scientists have developed a novel Omicron-specific mRNA vaccine that offers superior immune protection against two viral subvariants than standard mRNA vaccines. The new vaccine, called Omnivax, increased neutralizing antibody response against the BA.1 and BA.2.12.1 Omicron subvariants in pre-immunized mice 19-fold and eight-fold, respectively, compared with standard mRNA vaccines.

Although COVID-19 booster vaccinations in adults elicit high levels of neutralizing antibodies against the Omicron variant of SARS-CoV-2, antibody levels decrease substantially within 3 months, according to new clinical trial data.

Researchers found significant differences in movement patterns between participants with normal cognition and those with mild cognitive impairment or Alzheimer's disease.

Scientists have discovered how to design cereal roots able to continue growing in hard soils by altering their ability to penetrate, enabling roots to access sources of water deeper in soil, and helping 'climate-proof' vital crops in response to changing UK rain fall patterns.