Biology Insights

Chlamydia starts when the bacterium Chlamydia trachomatis is passed from one person to another during sexual contact, then invades the cells lining your genitals, rectum, or throat. It spreads through vaginal, anal, or oral sex without a condom with someone who carries the infection. With over 1.5 million cases reported in the U.S. in 2024 alone, it remains the most commonly ...

A twitching right eye almost always means the same thing as a twitching left eye: a tiny muscle in your eyelid is firing on its own, usually because you’re tired, stressed, or consuming too much caffeine. There is no medical significance to which side it happens on. The twitching is nearly always harmless, and it typically stops within a few days to a few weeks once the trigg...

Most 10-month-olds do best with a bedtime between 7:00 and 8:00 PM, though the exact time depends on when they wake from their last nap. At this age, babies typically need 11 to 14 hours of total sleep in a 24-hour period, with the longest stretch happening at night. There’s no single “correct” bedtime for every 10-month-old because the right time is driven by how long your b...

Stubborn warts resist treatment because the virus hiding inside your skin cells has found a way to dodge your immune system. About half of all warts clear on their own within a year or two, but the ones that stick around often need a layered, persistent approach. The good news: with the right combination of treatments and enough patience, clearance rates climb above 70%. Wart...

Most people start feeling better within two to three days of taking a Z-Pack for a sinus infection, though it can take up to a week for the infection to fully clear. The medication reaches peak levels in your blood within about 2.5 hours of the first dose, but killing enough bacteria to noticeably reduce symptoms takes longer. A Z-Pack (azithromycin) doesn’t work like a pain ...