The humble marble has been around for millennia: smooth spheres of stone or clay or steel or glass, in the pockets and toy boxes of children around the world. It's a rare family household that doesn't ...

Michelle Starr is CNET's science editor, and she hopes to get you as enthralled with the wonders of the universe as she is. When she's not daydreaming about flying through space, she's daydreaming ...