"After controlling for potential confounders, higher monthly ejaculation frequency was associated with a statistically significant decreased risk of total prostate cancer compared to the reference group at every time period."
At recruitment in 1992, 31,925 men from Health Professionals Follow-up Study were questioned on their average monthly ejaculation frequency during the ages of 20-29 and 40-49, and in the previous year (1991) from which a lifetime average was computed. During 437,490 person-years of follow-up, 3,839 of these men were diagnosed with incident prostate cancer, including 384 lethal cases. Cox proportional hazards models were used to compute the risk of prostate cancer associated with average monthly ejaculation frequency compared to a referent group reporting 4-7 ejaculations/month.
Ejaculation frequency and risk of prostate cancer: updated results from the Health Professionals Follow-up Study [Rider, Jennifer (Boston, MA); Rider, Jennifer; Wilson, Kathryn; Wilson, Kathryn; Kelly, Rachel; Kelly, Rachel; Ebot, Erika; Ebot, Erika; Giovannucci, Edward; Giovannucci, Edward; Mucci, Lorelei; Mucci, Lorelei/American Urological Association]
(via Reddit)
(Image: Grapefruit Skin,
Sam MacCutchan, CC-BY-SA)
Caltech posted video of a stable plasma torus, created by engineers using water and a dielectric plate: “lightning in a bottle, but without the bottle.” In addition, engineers working with the plasma noticed that their cell phones encountered high levels of radio frequency noise—static—while they were in the same room as the experiment. It turns […]
If you’ve ever observed “wine legs,” the rivulets that form when you swirl wine in a glass, you’ve seen the Marangoni effect. Watch how scientists are using this effect to create tiny motors that emit no pollutants.
MIT researchers have figured out how to infuse common plants like watercress and arugula with luciferase, the chemical that makes fireflies glow. The process make the plants emit a dim glow for up to four hours. Via MIT: Previous efforts to create light-emitting plants have relied on genetically engineering plants to express the gene for […]
Contrary to popular belief, mastering the fundamentals of robotics doesn’t have to be a mind-numbing slog through programming and electronics courses. SunFounder’s Nano DIY 4-DOF Robot Kit offers an intuitive and beginner-friendly way to break into the field by walking you through building your own programmable robot, and you can get it in the Boing Boing […]
