A 2025 study published in the Proceedings of the National Academy of Sciences found that ingesting less than three sugar-cubes' worth of macroplastic can be lethal to an Atlantic puffin, about two baseballs' worth of macroplastic can be lethal to a sea turtle, and about a soccer ball's worth of macroplastic can be lethal to a seal or dolphin.
November 20, 2025
high
statistical
Quantitative lethal-threshold equivalents for macroplastic ingestion estimated by a 2025 PNAS study.
A study published in the Proceedings of the National Academy of Sciences analyzed more than 12,000 MRI brain scans from nearly 5,000 healthy participants aged 17 to 95, with each participant having at least two scans taken over time.
high
temporal
Describes the study's sample size, age range, and longitudinal MRI data collection.