1 button: garden-variety dog.
1 centibutton: baby in sloth costume.
1 millibutton: pygmy marmoset.
1 microbutton: puppy wearing cape.
1 nanobutton: penguins hugging.
1 picobutton: baby gorilla and baby orangutan riding baby elephant while waving tiny flags that say “yay friendship.”
1 femtobutton: theorized by Pixar; not yet observed.
1 Planck button: cutest thing allowable under the standard model of physics.