When it comes to our planet's fluctuating temperatures over the last 34 million years, a lake in the Russian Arctic has lots to show.

Play NOVA's Polar Lab to see how! https://www.pbs.org/wgbh/nova/labs/lab/polar/

Hosted by: Caitlin Saks Production by: Ari Daniel & Lorena Lyon Camera: Emily Zendt NOVA Labs Editorial Director: David Condon

Additional Visuals: Mitch Butler, Diatoms of North America Sarah Spaulding, Earth Science and Remote Sensing Unit NASA Johnson Space Center Google Earth Motion Array Pixabay Shutterstock Videoblocks Wikimedia Carmelita Levin

Music: APM

© WGBH Educational Foundation 2020