Yes, science has done it again: Heavy marijuana use can mess with a teen's brain. The study, detailed in the Proceedings of the National Academy of Sciences, found that of the 1,000 New Zealanders followed, those who started using pot as teenagers and used it for years afterward lost some of their smarts; more specifically, they had an average decline in IQ of 8 points, between age 13 and age 38.
"The simple message is that substance use is not healthy for kids," study researcher Avshalom Caspi, a psychologist at Duke University and the Institute of Psychiatry at King's College London, said in a statement. "That's true for tobacco, alcohol, and apparently for cannabis."
10. Driving when drunk is unsafe
Drinking and driving really is dangerous. A study out this year showed that as a person's blood-alcohol level increased so did their risk of being killed or involved in a fatal crash, regardless of their age. For instance, compared with sober drivers of the same age, individuals who were ages 16 to 20 with a blood alcohol between 0.02 and 0.05 were nearly three times as likely to be involved in a fatal crash. The study, detailed in May in the Journal of Studies on Alcohol and Drugs, also found that more underage females who have been drinking alcohol are at risk for being in a fatal car crash compared with 2007. The researchers aren't sure what's behind the increase, but speculate girls are taking more risks nowadays.
11. High heels are bad for your feet
Cramming your feet into tight-fitting shoes with inches-long heels on the bottom can hurt your feet. The new finding out this year? High heel-wearing is linked to ingrown toenails. So who would've guessed that wearing tight-fitting shoes with a steep slope down is one of the most common causes a foot problem in which the toes get compressed so much that the big toenail grows into the skin? But seriously, while often an ingrown nail is just an annoyance, it can get infected and even require surgical removal of the entire nail.
To avoid the pesky podiatry problem, Rodney Stuck, a professor of podiatry at the Loyola University Health System, recommended buying less-tight-fitting heels (yes), and ditching the fashion statements on days when you plan to do a lot of walking and standing.
12. Screaming at your child is harmful to your child
Psychological child abuse, such as belittling, terrorizing, exploiting and neglecting emotionally, can damage a kid's health.
"We are talking about extremes and the likelihood of harm, or risk of harm, resulting from the kinds of behavior that make a child feel worthless, unloved or unwanted," Dr. Harriet MacMillan of McMaster University said in a statement. MacMillan added that examples would include a mother leaving her infant alone in a crib all day or a father pulling his teen into his own drug habit. Such abuse can be as harmful to children as physical harm, the researchers reported in August in the journal Pediatrics.
- 50 Sultry Facts About Sex
- The 10 Weirdest Animal Discoveries of 2012
- Trippy Tales: The History of 8 Hallucinogens
Copyright 2012 LiveScience, a TechMediaNetwork company. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.