Sea otter bones can turn purple - Popular Science

Stellar remnants called white dwarfs ‪appear to come in a rainbow of colors, according to a new study.

Exercise is good for you – that much we can all agree on – but which exercises work best for which types of benefit? Knowing that can help in developing personalized exercise programs that suit individuals better. In a new study published in the BMJ, researchers from China decided to analyze the connections between different exercise routines and bone mineral density (BMD), a key measure of bone strength. There was a particular focus on protecting against osteoporosis and the associated bone fragility that comes with getting older. With that in mind, the study team gathered data for 18,429 individuals aged 40 or over, taken from 124 previous trials. While it's well established that exercise can help strengthen bones, the researchers wanted to see which type of exercise might work best, and how much of it was needed.600 METs minutes-per-week was where the difference got meaningful. (Lu et al., BMJ, 2026)"Age-related declines in bone mineral density are strongly associated with reduced bone strength and increased fracture risk," write the researchers in their published paper.