QUESTIONS for Cool Jobs: Super Small Science
![Arrows point to elbows created in carbon nanotubes in this close-up of a nanotube sponge. The elbows are created by boron atoms, and give the material its sponginess.](https://www.snexplores.org/wp-content/uploads/2019/11/860-questions-b-doped-tube-elbows.jpg)
Arrows point to elbows created in carbon nanotubes in this close-up of a nanotube sponge. The elbows are created by boron atoms, and give the material its sponginess.
Mauricio Terrones/Pennsylvania State University