Your nose, mouth, skin pores and…other…body holes each serve their unique functions. But most of them also double as biological exhaust pipes, spewing gaseous byproducts of the myriad internal chemical reactions keeping you alive.

And, just as we measure emissions form our internal-combustion vehicles, advances in medical technology make it easier to analyze the gases you leak into the atmosphere.

Scientists at RMIT University in Australia developed a pill-sized sensor that measures hy