No, it doesn't; it runs out. See for yourself with this hourglass full of iron filings. The steel base has a magnet, so time flies when the glass is on it, and the filings make pretty stalagmites. Stick a magnet on the neck, however, and you can stop time altogether. Glass is 5-1/2" tall on the base and filings run out in about 40 seconds (three trips make a two-minute egg) with the magnet, somewhat longer without it.

Spin this spindle and watch it turn in perpetuity!!  Well, for a long time anyway.  Inside the 5-1/2" long colored plastic spindle are magnets which are repelled by magnets in the 5" x 3" black plastic base.  The variously colored spindle floats in the air above the base thus virtually free of normal friction. Nifty desk toy named "Revolution".

Please note #91664 with flashing red lights was incorrectly advertised, that item is not available. 

Newtonian demonstrator for science teachers. Mindless play for the rest of us. These are shiny, nicely balanced, high-performance examples of the classic Newton's Cradle - a ball on one end of a row of (5) suspended, barely touching balls swings into the others, and the ball at the opposite end reacts to the collision. The 11/16" dia balls in the small version (all-metal frame 6-1/2" high x 4" x 4-1/4") will collide about 30 times. The 7/8" dia balls in the large version (metal frame 5-1/4" high x 4" x 6", with a wooden base) will collide about 100 times. Awesome. Even more awesome that we paid someone to count the bounces just for you! (Unpacking note: Less awesome if you just yank it out by the suspension lines and pull a couple of balls loose. Be gentle.)

You could put photos in these clear acrylic standing easel frames, or you could use them as place cards, or you could have photo-place cards and nobody would have to read to find their seat. You get a dozen little standing frames, 6" tall x 4" wide, at a very nice price.

Can’t get to the gym? Need something to take your frustrations out on? Herewith, the desktop suction-cup speed bag. Measures 6-1/2" dia on a 5-1/2" spring with a 7" suction cup on the other end. Comes with an air pump to inflate it. Works fine and takes a licking on a desktop, and might just hang on from a tile ceiling in a shower--for added fight-gym verisimilitude--but we don’t have an office shower to test it on.

Well, if you had a crystal ball, you'd be able to see that there's a crystal ball in your future, and you'd know not to pass up this very, very nice glass gazing ball. It's 4-1/4" dia (and heavy) and comes with a footed dark-wood stand that spins smoothly. The stand is just over 3" dia. Together, the ball and stand are 6-1/4" tall. Comes in a presentation and storage box. The perfect accessory for your next fortune-telling gig.

Our each is one dozen gorgeous, glimmering glass gems, in a round cut in (12) different colors, including pink, green, blue, red, golden, white, and various shades of each. Think diamond, ruby, sapphire, emerald, amethyst, topaz, whatever. In dark blue book-like presentation boxes. You pick the Princess Pack, with (12) gems at 20mm across (approx 3/4” or a tad bigger than a nickel) by 13mm (approx 1/2”) deep, or the Queen collection at 40mm across (approx 1-1/2” or tad bigger than a silver dollar) by 27mm (approx 1”) deep.

Time was, these service bells were on every teacher's desk and the front desk of every hotel in the world. They're still a classically beautiful design, and they'll still bring folks running when you tap the little plunger on top. The shiny matte chrome bell sits on an enameled steel base and the whole thing is 3-1/8" dia x 2-1/4" tall.

Bigger than a baseball across the top, this is one ginormous jewel. You pick a clear or deep-translucent-blue, 24% lead crystal, cut-glass gem. It’s 3-1/8” dia at the top, tapering to point 2-1/8” deep. Could be mounted in a stunning, but really, really, really big engagement ring.

These glazed ceramic human skull banks are a nice desk size at just 4-3/4" x 3-1/4" x 3-1/4" with slots on their little crowns and rubber plugs at the brain-stem openings. We’ve got flat black and metallic-glazed in gold, silver or purple, and you’ll get (2) different, which you can tell people is your new skull set. If you’re not into saving money, they’re great for parties or just general home decor if that’s how you roll.