ScienceInsights

The appendix isn't useless after all. It plays real roles in gut bacteria, immunity, and fetal development — and removal may have subtle long-term effects.

Learn to recognize athlete's foot by its different appearances on skin and toenails, and how to tell it apart from similar conditions.

Bactrim treats very few STDs. Learn which infections it covers, why it often isn't the right choice, and how to get proper STD treatment.

Lupus can affect nearly every organ in the body. Learn which complications are most serious and what factors influence how severe the disease becomes.

Sagging skin has several effective treatments, from retinoids and collagen supplements to radiofrequency and surgery. Here's what works and for whom.

Chronic neck pain can stem from disc changes, nerve issues, posture, or stress. Learn the common causes and signs it's time to see a doctor.

The term "nutritionist" isn't regulated, so credentials matter. Learn what certified nutritionists actually do, how they differ from dietitians, and how to verify their qualifications.

Apple calories vary by size, preparation, and whether you eat the skin. Here's what you're actually getting nutritionally from a whole apple.

Leg aches, cramps, and heaviness can have many causes. Learn what your specific symptoms might mean and when to see a doctor.

Newborns typically sleep 14–17 hours a day, but not all at once. Here's what to expect in those first three months.