Mercury is tiny, barely bigger than the Moon. Its metallic core makes up 70% of the planet’s mass, vastly exceeding Earth’s 32% and Mars ’ 25%. It’s unlikely that the core actually formed like this.

From the earliest year of school, children begin learning how to express ideas in different ways. Lines across a page, a wobbly letter, or a simple drawing form the foundation for how we share meaning ...

On her first full day of preschool, Alexander Lane’s 3-year-old daughter stayed in the car for an hour at drop-off because she didn’t want to go inside. On the second day, she entered class in tears.

The actor and author, who didn't fall in love with reading himself until his 30s, wants kids to get something special out of his milestone publication, 'Detective Duck: The Mystery at Emerald Pond', ...