Winter, spring, summer, and fall — the first days of every season are marked with a solstice or equinox. Each occurs twice a year, thanks to the tilt of our planet’s axis as it travels around the sun.
Find out what leads to longer and shorter days, curious effects at the Equator and the Poles, and seasonal opposites in the Northern and Southern Hemispheres.
To some it means sledding, snowmen, and holidays. To others, shoveling and warm boots. But to scientists, snow is an opportunity!
Explore how snowflakes are categorized. Find out how snow crystals form high in the atmosphere and if it ever gets too cold snow. And discover why NASA is surveilling snow from space.
Mmmmm, chocolate. It's been a currency, an aphrodisiac, and a bitter, spicy drink. It's also the tasty treat we know and love.
The process of moving from bean to bar is one steeped in history, culture, and science. Explore the complex flavors and cutting-edge research of chocolate.
Any bird that "makes its living" from the ocean beyond the surf zone is part of this diverse collection of marine birds. Several orders are included.
From gulls and albatross to penguins and the blue-footed booby, there are nearly 500 species of seabirds. Explore how their anatomy and habits make them well-suited for ocean life.