Bag of Beans

Use this handy site to calculate how much caffeine you’ve had.

• Link (via Lifehacker)

Can a cat parasite infect humans as well? An article on Discover suggests that Toxoplasma gondii is altering the behaviour of its human hosts, and can even cause a shift in the sex ratio of their babies in favour of males.

Five years ago, Oxford University zoologists showed that the parasite Toxoplasma gondii alters the brain chemistry of rats so that they are more likely to seek out cats. Infection thus makes a rat more likely to be killed and the parasite more likely to end up in a cat—the only host in which it can complete the reproductive step of its life cycle. The parasite also lives in the brain cells of thousands of species, including about 60 million supposedly symptom-free Americans. Studies over the past few years have suggested that toxoplasmosis infections in humans, too, may cause behavioral changes—from subtle shifts to outright schizophrenia. Two studies this year add even weirder twists.

• Link (via Boing Boing)
• Parasites on the Brain [damninteresting.com]

This article explains why some hypothermia victims undress themselves even as they freeze to death.

Shunting blood to your core and away from your extremities is accomplished through vasoconstriction of your peripheral circulation. This allows the outer portions of your body to become better at insulating your core, since it is losing less heat to the outside world.

And now the key to what causes paradoxical undressing. Vasoconstriction occurs when the smooth muscles within the vasculature contract. This effort requires a steady input of energy in the form of glucose from the body’s energy stores. However, due to a lack of blood now traveling to these muscles, they eventually tire. As the muscles of the constricted blood vessels run out of energy, they fatigue, relax, and open up. This is known as vasodilation.

With vasodilation of the blood vessels, an infusion of warm blood from the core of the body rushes into the peripheral extremities. This causes the hypothermia victim to feel overly warm and to start shedding layers of clothing, contrary to the reality that their body temperature is continuing to drop.

• Link (via Digg)

Related:

• James Kim found deceased

Not really surprising, but playing action games can help improve your visual processing abilities.

In an article to be published in Psychological Science, they have shown that people who played action video games for a few hours a day over the course of a month improved by about 20 percent in their ability to identify letters presented in clutter—a visual acuity test similar to ones used in regular ophthalmology clinics.

In essence, playing video game improves your bottom line on a standard eye chart.

• Link (via Digg)

This article examines some of the myths and facts surrounding coffee and your health. For example, recent studies indicate that drinking coffee may reduce your chances of developing Type 2 diabetes, and could also protect you from Parkinson’s disease.

In the interest of coffee drinkers everywhere, here are the latest thoughts from leading researchers about coffee and whether it can enhance—or not—our health. We are “spilling the beans” on who should and shouldn’t be drinking coffee, especially if you suffer from certain conditions.

• Link (via Digg)