Harvard scientists make odd-shaped bubbles.

scientists say they've found gas bubbles can exist in stable, non-spherical shapes without the application of external force.

The researchers say they created the micron- to millimeter-scale peapod-, doughnut- and sausage-shaped bubbles by coating ordinary gas bubbles with a tightly packed layer of tiny particles and then fusing them.

"Particles have been used to stabilize emulsions and foams for over 100 years," said lead author Anand Bala Subramaniam, a research associate in Harvard's Division of and Applied .

"However, we've demonstrated that not only are particles useful for making bubbles last longer, they fundamentally alter the properties of these bubbles," said Subramaniam.