Michelle Pang and Nikki Teran take a look at the world of optogenetics, where light is used to activate and manipulate neurons. We talk about how this works, what it has to do with a tiny green algae, and the crazy things people can do with it. You can read the source material here for more on optogenetics: https://doi.org/10.1146/annurev-neuro-061010-113817 https://doi.org/10.3410/B3-11 https://doi.org/10.1038/nn.4091 -- Music by Ryan Little, Nctrnm, and Podington Bear.