Ionization smoke detectors use a tiny amount of radioactive material to sense fast-flaming fires. Learn how they work, their pros and cons, and whether they're safe.
Americans are having kids later than ever. Here's what the data shows about average parenting ages, global comparisons, and what biology says about timing.
A biophysical profile checks your baby's health using ultrasound and heart rate monitoring. Learn what the test measures, how it's scored, and what results mean.