What are Nanodots? They're tiny. And round. They're silver or gold or black or just metal-colored. They're magnetic ridiculously magnetic, so that it takes a tenacious tug to get them apart. They also stick to you: not literally, but once you pick them up it's very hard to put them down. Nanodots come in packs of 216, which you can (and will) squish and massage into a surprising number of geometric shapes. They also like to stick end to end to form strings and ropes. They're perfect for kids curious about magnetism and geometry not very young ones, please; you definitely don't want a toddler swallowing one but they're even better for adults who need something to do with their hands during long, boring meetings.
Price: $29.99 at Thenanodots.com