Great ideas are shocking! Little Grey Cells by GIANTmicrobes are intelligence-based products designed to amuse and educate.This adorable neuron will have you thinking about your brain cells and how they work together to make you who you are. Neuron represents the approximately 100 billion brain cells in your head. With over a 1,000 trillion connections, or synapses, there are more transmission-pathways in your head than there are atoms in the universe Excellent gift for students, teachers, scientists, doctors and any lover of brains and minds Vinyl keychain comes in colorful packaging with product information printed on the back Clip onto your backpack, luggage, keys and anywhere you go! Size: 2" x 1" x 1/4"