A red knot is a tiny shorebird that makes an epic 9000-mile journey all the way from the arctic to the tip of southern Chile and back. Biologists and nature enthusiasts congregate at various points ...

Space to play or pause, M to mute, left and right arrows to seek, up and down arrows for volume. Hello! Today we are learning how to use numbers to count a collection of objects. Let's try seven. When ...

Decades of cognitive research reveal that parrots can understand what numbers represent. Here’s how these birds use them to ...

Is it possible to count objects you can't see? If you've ever received a boxed gift, or a mysterious package from Amazon, you might have tried to lightly shake the box to try to guess its contents.