#NatGeo33# changemakers Austin Roorda and Ren Ng used laser pulses to induce test subjects to see a color beyond human perception, and they say their method can help doctors replicate and better treat symptoms of degenerative eye disease: https://t.co/XoYXDxSXgD https://t.co/vwZvWeqhPX

#NatGeo33# changemaker @LuisvonAhn, @duolingo co-founder and CEO, is helping refugees overcome barriers to language education and empowering those who need language learning most. See how von Ahn’s work is helping learners worldwide: https://t.co/DrZz2xqVqm https://t.co/AgidHpQjmz

Double the #NatGeo33# changemakers means double the time. Idris and Sabrina Elba share what they’re passionate about, what drives their investment in sustainable solutions in Africa, and that Sabrina can’t stop obsessing over tortoises. See the full list: https://t.co/Bbs4fWRft5 https://t.co/WB1PhzBOZa

Microplastics are everywhere, but #NatGeo33# changemaker Cassandra Rauert has created a lab where background levels of plastic are at least 100 times lower than in a conventional lab. Read more: https://t.co/ngFlrLEa46 https://t.co/hCko79ALh5

Like so many of us, #NatGeo33# changemaker Ewan McGregor was inspired by the Nat Geo documentary Ocean with David Attenborough. Learn more about his passion for exploration: https://t.co/uXNmVc0wJ9. Stream Ocean with David Attenborough on @DisneyPlus and @hulu. https://t.co/Gifx2Vzyqt

“Storytelling for a better planet" is at the center of actress and #NatGeo33# changemaker Alia Bhatt @aliaa08's work as an advocate and activist. See the full list: https://t.co/2V9L1ojUk9 https://t.co/awWBxcwpob

High above Medellín, Colombia, botanist and #NatGeo33# changemaker Daniel Piedrahíta refuses to let any orchid go extinct. By cloning rare species and harvesting microscopic seeds by the millions, he’s safeguarding them for the future. Read more: https://t.co/8eIAhj11xt https://t.co/J9nhKfJnPz

Ethnobiologist, National Geographic Explorer, and #NatGeo33# changemaker Kerllen Costa has worked with communities in Angola to identify roughly 150 new species in the highlands surrounding the Okavango River headwaters. Read more about Costa’s conservation work: https://t.co/TWRidxiolX