Known as the Sargasso Sea, sailors have crossed it for centuries, but few notice the border when they slip into glassy indigo ...

In Kristi Fowler’s transitional kindergarten classroom, 4-year-olds learn math by counting steps as they jump and by sorting objects by shape or color. They can skip-count by 10s to get up to 100 and ...

Plants changed the atmosphere, built soil and created ecosystems that allowed animals like us to thrive. But first they had ...