Biology Insights

Current CDC data shows about 1 in 36 US children has autism. Here's what the numbers reveal about prevalence, gender gaps, and support needs.

Safe, effective ways to clear water from your ears after swimming, plus what to avoid and when to see a doctor.

Viagra typically kicks in within 30–60 minutes and lasts around 4 hours, but food, stress, and dosage can all affect how well it works for you.

Early teething is possible at 3 months, but not guaranteed. Learn safe ways to soothe a fussy baby and what products to skip.

Bed bug bites typically heal within 1–2 weeks. Learn what affects recovery time, how to relieve itching, and when to see a doctor.

Concussions often show up in the eyes — from unequal pupils to tracking problems. Learn what these visual signs look like and how doctors test for them.

Most guys finish faster their first time than they'd like. Here's what's actually normal, why it happens, and how things tend to improve over time.

Hard bumps on the vagina are usually harmless cysts or ingrown hairs, but some may need medical attention. Learn what's likely causing yours.

Most men overestimate how small they are. Here's what the evidence says about weight loss, traction devices, and the methods not worth trying.

Sun blisters heal best when left intact. Learn how to soothe burned skin, care for blisters daily, and know when to see a doctor.

Prenatal vitamins aren't harmful for most people, but higher iron and vitamin A levels mean a regular multivitamin is usually the better choice.

Most percentiles are normal at 32 weeks. Learn what growth charts actually measure, when to be concerned, and why ultrasound estimates have real limits.

At 5 weeks pregnant, your embryo is about the size of a sesame seed, yet major developments are already underway.

Back of tongue pain is often harmless, but it can sometimes point to reflux, nerve issues, or other conditions worth treating. Here's how to tell the difference.

Find out how much protein you actually need to build muscle, when to eat it, and whether high intake is safe for healthy adults.

Hair thinning in your 20s is more common than you'd think. Learn the most likely causes, from iron and hormones to stress, and what to ask your doctor.

Spit-up at 6 months is usually normal, but here's how to tell the difference and what can actually help reduce it.

Taking too long to finish can stem from habits, medications, or tension. Here are practical ways to make sex feel more satisfying for you and your partner.

At 8 weeks, your baby is about the size of a raspberry with tiny fingers, forming facial features, and a rapidly developing brain.