The fourth episode of "Cosmos: Possible Worlds" sees host Neil deGrasse Tyson looking to the past and honoring botanist Nikolai Ivanovic Vavilov, pioneer of modern plant breeding.
The fourth episode of "Cosmos: Possible Worlds" sees host Neil deGrasse Tyson looking to the past and honoring botanist Nikolai Ivanovic Vavilov, pioneer of modern plant breeding.