Smarter Men Have More Sperm

Women tend to like smart men because they’re usually more successful and better providers. But here’s another reason: Their sperm is better, a new study says.

Researchers at King’s College London, the University of Delaware and the University of New Mexico recently compared results from five intelligence tests given to 425 Vietnam War vets in 1985 as part of the U.S. Centers For Disease Control and Prevention’s Vietnam Experience Study. These vets, aged 31 to 44, also provided sperm samples, so the researchers analyzed the sperm per milliliter of semen, plus how many of the sperm swam normally, and other measures of sperm health.

The smarter the men were, the more sperm they produced and the better their wee ones swam — and it didn’t matter how old the men were or whether they smoked, drank or were obese.

Read more from Smarter Men Have More Sperm

How Much Sleep Do You Really Need?

Q: How much sleep is ideal?

A: Studies show that people who sleep between 6.5 hr. and 7.5 hr. a night, as they report, live the longest. And people who sleep 8 hr. or more, or less than 6.5 hr., they don’t live quite as long. There is just as much risk associated with sleeping too long as with sleeping too short. The big surprise is that long sleep seems to start at 8 hr. Sleeping 8.5 hr. might really be a little worse than sleeping 5 hr.

Read more from How Much Sleep Do You Really Need?

Marijuana “epidemic” shows Japan’s drug allergy

TOKYO (Reuters Life!) – First a sumo wrestler, then an actor, now students at elite universities and a tennis player — the list of people caught using marijuana has sparked fears of reefer madness in Japan.

More than 2,000 people were arrested on dope charges between January and October this year, a 19 percent increase on the same period last year, according to the National Police Agency.

“(The) increase in marijuana abusers, as well as tightening regulations, are both factors that pushed up the number of arrests,” Shingo Katsuno, vice president and an expert on Japan’s drug issues at Hyogo University of Teacher Education, told Reuters in a telephone interview.

“Japan is now highly interested in the issue because it is spreading in places like colleges, where it hardly existed before,” he added.

Read more from Marijuana “epidemic” shows Japan’s drug allergy

Science of Snacks: Thinking Makes You Hungry

A study in the journal Psychosomatic Medicine contends that intellectual work—that’s right, I’m calling writing this stuff, ya know, intellectual—induces a big increase in caloric intake. The research had 14 Canadian students do three things at different times: sit and relax; complete a series of memory and attention tests; and read and summarize a text. (It was that last activity that disqualified rodents and U.S. students as study subjects.) After 45 minutes at each task, the kids were treated to an all-you-can-eat buffet lunch. Because Canada has a truly advanced code of human-subject research ethics.

Read more from Science of Snacks: Thinking Makes You Hungry

Stretching: The Truth

If you’re like most of us, you were taught the importance of warm-up exercises back in grade school, and you’ve likely continued with pretty much the same routine ever since. Science, however, has moved on. Researchers now believe that some of the more entrenched elements of many athletes’ warm-up regimens are not only a waste of time but actually bad for you.

Read more from Stretching: The Truth