The Mouse That Soared
Scientists recently sent freeze-dried mouse sperm into low-Earth orbit to study the effects of space radiation on fertility and reproduction. After spending between three and six years aboard the International Space Station, the researchers brought the sperm samples back and thawed them to produce healthy mouse pups.
They found gene expression in the space mice didn't differ from pups fertilized with fresh, earthbound sperm, but it was noted that radiation exposure aboard the ISS is lower than what might occur on an interplanetary trip.
A national survey recently cited the most common barriers and reasons why some eligible adults do not get vaccinated for COVID-19. Among the barriers, people claimed they were too busy or did not know their eligibility status. Among the reasons for hesitation: concerns about safety and a false belief that the vaccines can give you COVID-19. One-third cited their personal right to opt out.
Body of Knowledge
Hair grows fast, about six inches per year on average. The only thing in the body that grows faster is bone marrow, which generates about two million red blood cells every second.
Get Me That, Stat!
The persistent mortality divide between urban and rural living has deepened. A new Centers of Disease Control and Prevention study looked at the last 20 years and found that in 2019, the morality rate in urban parts of the U.S. was nearly 665 deaths per 100,000 people; in rural areas, it was 834 deaths per 100,000 people. The gap from 1999 to 2019 grew 172%.
1 in 5: Ratio of U.S. adolescents who were within a six-minute walking distance of gun violence in recent years