The main recurring element features a balloon twister popping balloons with a knife. Party locations are often decorated with colorful decorations, such as balloons and streamers. Almost all gas balloons and airships now use helium. Examples are bubbles formed at the bottom of a champagne glass and helium balloons. The military was interested in helium for balloons and dirigibles. The inhalation from larger helium balloons has been reportedly fatal. As such, it has been featured on Mylar birthday balloons and cupcakes. Hot air ballooning is the activity of flying hot air balloons. Aerial survey is conducted using cameras attached to airplanes, balloons, UAVs, or even Kites. Aerostats include unpowered balloons and powered airships. These combine the structures of both hot-air balloons and small airships. It made use of cheap, simple balloons filled with hydrogen. This is useful in aircraft, rockets, satellites, weather balloons, and many other applications. One could buy crockery decorated with naive pictures of balloons. Pete was on the bags, cups, balloons, and hand puppets for the kids.