To model how sand jams in an hourglass, physicists combine two gridlike math models. Flowing sand is vulnerable to jamming, including a jamming transition that could be disrupted. Granules and the ...

Physicists have long known that the flow of sand through an hourglass is entirely different from the flow of liquid. In the case of a liquid, the rate of discharge depends on the pressure at the ...

At Gold Bug in Pasadena, owner Stacey Coleman swears that this hourglass runs on weighty silver-plated sand. It comes in a wooden gift box, so you don’t even need to wrap it. Price: $42.

The steady methodical flow of sand through an hourglass as it succumbs to the pull of gravity is a great way to kill time—but not a very productive one. This clever alternative hopes to change ...

But this is an hourglass with a difference. It doesn’t have sand. It is terribly difficult to make. And it costs a small fortune. Newson has teamed up with Hodinkee to make the hourglass ...

After the debut of her Live Screen hydroponic garden during NY Design Week 2012, Brooklyn-based designer Danielle Trofe is returning this year with a new series of off-the-grid LED lighting ...