You probably don’t know the pH. As a little chemistry lesson, everything has a pH level that ranges from 0 to 14. When the pH is neutral, that means it’s right in the middle at 7; it’s acidic when it’s below that, and when it’s alkaline when it’s above. Your scalp, like the rest of your skin, runs at about 5.5. This is all important because your skin’s pH is and can be affected by the products you are putting on it....

Aside from being an eyesore, dust can cause allergic responses1 like red, watery eyes; a runny nose; itchy throat; and sneezing as it piles up at home. If you’re not sure how much you should be dusting or are unclear about the best dusting protocol (feather dusters—yea or nay?), here’s what a toxicologist and a green cleaning expert had to say on the matter. There’s no universal guideline for how often you should be dusting to prevent dust mites; it depends on your home....

That’s OK—there are plenty of other ways to get rid of those pesky half-moons, both for the long and short term. Ahead, we asked experts how to target the circles at their source. There’s a pervasive notion that men’s skin is “thicker” or “tougher” than women’s—so you might wonder whether men experience less severe half-moons. But let’s unpack this myth: Research has noted that the dermis (aka where elastin and collagen are produced), is 10 to 20% thicker in men than in women1, which is why many believe men experience fewer visible signs of aging, like fine lines....

For a little background, when it comes to sperm health, it’s not just quantity that counts. Quality—which refers to the shape (morphology) and mobility (motility)—matters, too. Sperm quality also goes beyond these metrics. DNA errors in the sperm, problems with the Y chromosome, and, surprisingly, even the endocannabinoid system are all relevant to sperm maturation and health, as well. Moreover, the men included in these meta-analyses were not receiving fertility treatment or otherwise thought to be experiencing fertility challenges; therefore, the men most affected by the factors contributing to declines in sperm quantity were not included....

And while factors like diet and exercise play a major role in balancing your blood sugar, ultimately it comes down to—like so many other things—your gut. All of this is regulated by a complex process involving your liver, small intestine, and pancreas (aka the gut). The pancreas releases a hormone called insulin, which allows your cells to absorb that sweet, delicious glucose in the first place. Those with type 2 diabetes however, produce less insulin—or their insulin isn’t working as it should—and, over time, they have trouble regulating their levels of blood sugar....

Good news: According to the experts, there are a few nail care tweaks to help make your nail polish last longer. Here, their tips and tricks to give the mani some staying power: That said, you’ll want to avoid soaking your fingertips after the mani, too (with warm baths, washing dishes, and the like). Not only can the water cause your nails to expand and contract, which can lift the pigment, but it can also make them brittle and dry over time....

And yet, it often feels like a weird taboo—even though most people are doing it. Most people have never really learned how to do it, why it’s good for us, and what a healthy masturbation practice even looks like. Instead, it’s typically done in secret, coated in a thick layer of shame, and often becomes a confusing topic of conversation when we enter into romantic relationships with other people. You’re likely here because you’re now embarking on developing a masturbation practice....