Newton's Gravity Glass - 3 Minute
http://www.officeplayground.com/Newtons-Gravity-Glass-3-Minute-Purple-P707.aspx
Fascinating and elegant, this beautiful hand-blown glass sand timer features double action powered by gravity. When you flip the Newton's Gravity Glass over, the hourglass within the liquid-filled glass cylinder moves upward as the sand within it falls. The sand takes approximately 3 minutes to flow to the bottom of the hourglass. This is an awesome desk accessory that will entertain you and your co-workers as you try to figure out how it does that double gravity thing!
What about the air gap?
ksmomma05 3 months ago
not very hard to figure out that something lighter then water will float and sand is affected by gravity...
Tj1056 4 months ago
screw gravity!
MrSuperdude2468 6 months ago
soo. how?? & first!
zazaalobffs4ever 6 months ago
nice really nice
15godfather1 7 months ago