Having a baby: Stages of pregnancy by trimester By Cari Nierenberg 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.
Cottonmouth snakes: Facts about water moccasins By Jessie Szalay, Patrick Pester Cottonmouths, or water moccasins, are venomous snakes in North America that display white mouths when threatened.
What is the Milky Way? By Paul Sutter 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.
Mood swings & mommy brain: The emotional challenges of pregnancy By Cari Nierenberg A woman's emotional well-being and her mental outlook play important roles in pregnancy.
Lemurs: A diverse group of endangered primates By Patrick Pester Lemurs include a diverse group of primates, from sun-worshipping ring-tailed lemurs to the peculiar, nocturnal aye-aye.
Greenhouse gases: Causes, sources and environmental effects By Tiffany Means, Marc Lallanilla 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.
Sunken cities: Discover real-life 'Atlantis' settlements hidden beneath the waves By Nikole Robinson, How It Works magazine Explore the submerged cities to discover why they didn’t survive the test of time.
Human brain: Facts, functions & anatomy By Tanya Lewis, Ashley P. Taylor The human brain is the command center for the human nervous system.
What is plate tectonics? By Tiffany Means Blame plate tectonics for Earth’s mountains, earthquakes, volcanoes, and why its continents fit together like pieces of a giant jigsaw puzzle.
What is quantum entanglement? By Paul Sutter 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.
What are Homo sapiens? By Sarah Wild All living humans are Homo sapiens. Here's what scientists know about the origin of our species.
Vaginal birth vs. C-Section: Pros & cons By Cari Nierenberg, Sarah Wild A woman can deliver her baby either by vaginal birth or a C-section. Here are the advantages and disadvantages of both.
How does time work? By Jonathan O'Callaghan, How It Works magazine 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.
Frederick Douglass: The slave who became a statesman By All About History How did Frederick Douglass, an enslaved man from Maryland, become an international celebrity, author and abolitionist hero?
Horses: Domestic, feral and wild By Patrick Pester There are hundreds of different breeds of horse, from the slender Thoroughbred racehorses, to the massive shire workhorses, to the itty-bitty miniature horses.
Egg-laying mammals and peacock spiders: Meet some of Australia's weirdest creatures By Scott Dutfield , How It Works magazine Some of the world's strangest species can be found down under, from dolphin-tailed sea cows to mysterious marsupial moles.
Signs of labor: 6 clues baby is coming soon By Cari Nierenberg, Ashley P. Taylor 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: Causes and remedies By Ashley P. Taylor, Jessie Szalay Tooth sensitivity is a common dental problem that involves discomfort or pain in teeth when encountering certain substances and temperatures.
Photos: 10 extraordinary ocean worlds in our solar system By Luis Villazon, All About Space magazine Pack your bathing costume — our solar neighborhood is much wetter than you think.
