Only half the weight of a dollar bill, this radio-controlled Carbon Butterfly airplane is the worldâs lightest at merely 3.6 grams. Recently improved from a previous design, the new model is super flexible and brand-new to the market. At $300, it's a pricey toy, butânearly indestructible, quiet, durable, and featuring a simple modern designâthe cost's worth it. Especially considering that most radio-controlled planes are similarly priced, but are difficult to build, noisy, and intended only for outdoor use. Plantraco is easy to use in a tiny apartment ("The coffee table is your runway!") or outside at a range up to 400 feet. You can pre-order from Plantraco or just go to their site to watch the fun living room flight demo.