Helium balloons are a quintessential party favor, a fixture of any birthday, wedding or anniversary party. ""Aerogels are ultralight materials that are basically 98 to 99 percent open space or void space, so they're very low density materials, and the ones we produce here are about 20 times the density of air," he explained in an interview with Salon. And in our papers, in our publications,  we are trying to prove it