Add Yahoo as a preferred source to see more of our stories on Google. This customer, Marble Machine No. 12, is an exemplar of the form. It turns AAA battery power into an perpetually looping interplay ...

Marble machines are the coloring books of the appliance world. A weirdly soothing attention vortex, this contrivance asks nothing and offers nothing except the joy of watching gravity pull a sphere ...

For decades, the question of how to keep a Slinky in perpetual motion has befuddled scientists and toy owners alike. Now, one man may have the answer to ensure the Slinky fun never stops. Matthias ...