Pregnancy lasts about 40 weeks and is divided into three stages, or trimesters, each with unique symptoms and changes in the mother's body and in fetal development.
Cottonmouths, or water moccasins, are venomous snakes in North America that display white mouths when threatened.
Find out all the science of the Milky Way, including the size of our home galaxy, who discovered it and how it's on a collision course with another galaxy.
Lemurs include a diverse group of primates, from sun-worshipping ring-tailed lemurs to the peculiar, nocturnal aye-aye.
Greenhouse gases are atmospheric gases that absorb infrared radiation and trap heat in the atmosphere. Increases in emissions of these gases are leading to climate change and global warming.
Blame plate tectonics for Earth’s mountains, earthquakes, volcanoes, and why its continents fit together like pieces of a giant jigsaw puzzle.
Quantum entanglement is one of the uber-bizarre phenomena seen when things get itty-bitty. Here's a look at how entanglement works and why it's so weird.
A woman can deliver her baby either by vaginal birth or a C-section. Here are the advantages and disadvantages of both.
From the beginning of the universe to the present day, it's one of the few things we regard as regular and unchanging. But is it really so constant? We take a look at the physics of time.
How did Frederick Douglass, an enslaved man from Maryland, become an international celebrity, author and abolitionist hero?
There are hundreds of different breeds of horse, from the slender Thoroughbred racehorses, to the massive shire workhorses, to the itty-bitty miniature horses.
Some of the world's strangest species can be found down under, from dolphin-tailed sea cows to mysterious marsupial moles.
Every labor story is different, but there are definitely signs that can let you know if you are in the early stages of labor.
Tooth sensitivity is a common dental problem that involves discomfort or pain in teeth when encountering certain substances and temperatures.