The American International Toy Fair is the stuff of dreams—both childhood and adult. All the newest toys, including magnetic sand, remote-controlled pterodactyls, stuffed-animal Grumpy Cats and endless construction sets, are not only on display throughout three massive floors—they’re unboxed. With wide eyes, Scientific American scoured the aisles in New York City’s Javits Convention Center this February for the standout science and technology toys of 2015.