He (and his team) are amongst my all-time greatest #ScienceSuperHeroes.
They literally gave their lives to save the world from hunger, battling in the face of an anti-science dictatorship.
Here's their story in 4 tweets...
His discoveries about the origins of crop genetics helped transform how we farm, even today.
Travelling the world, he amassed a vast bank of seeds to breed new high-yielding varieties w the aim of ending hunger.
Some ultimately starved to death inside, despite being surrounded by grain, to save the collection for humanity.
He was sentenced to the Gulag & died of starvation there, due to his dedication to science.
His work, however, revolutionised farming. Helping save millions from hunger.