Mood rings were invented in 1967 by a man named Marvin Wernick, who saw a great idea for a toy when he saw one of his friends take a child's temperature by using a strip of thermotropic material. A mood ring is essentially a liquid thermometer that changes color according to the temperature on the wearer's skin. It is thought that this may indicate the mood of the wearer, as some claim that body heat fluctuates with the emotional state of the wearer. Highly recommended when trying to find out what your loved one is really feeling--or if you need a small but neat stocking stuffer, gag gift or novelty toy!
Note: Ring comes in a variety of sizes. Although we do try to accommodate requests for specific sizes, we cannot guarantee which size will be sent to customer.
Warning: Choking hazard due to small parts. Not for children under 3 years old.
Comprehensive collection of 30 fossils.
Get swept away by this fantastic robot kit that uses vibrations to move!
Build your very own smart robot!
This kit includes several different projects that demonstrate the power of magnets!
Working model representing the sun, earth, and moon and their relationships.
This black scorpion specimen is great for the classroom setting!
At xUmp.com you will find a large selection of scientific products carefully curated by real scientists and educators. We sell everything from educational toys, teacher supplies for science classroom, lab equipment, science toys, science fair supplies, classroom equipment, chemistry glassware, chemistry lab equipment, physics demos, electronics supplies, robots, science kits to geeky science gifts.