Photo Acknowledgements

Sources of the photos used on this site:

Arctic tern: © AWeith via Wikimedia Commons

Author and family photos: © Rebecca E. Hirsch

Carbon dioxide and water into ethanol reaction: © Argonne National Laboratory

Cheerleaders: © Leahadams1 via Wikimedia Commons

Chinese chestnut burr: Plant Image Library via Wikimedia Commons

Inoculations on small chestnut trees: © The American Chestnut Foundation

Giant chestnut tree: © The American Chestnut Foundation

European robin: © Francis C. Franklin via Wikimedia Commons

Fallingwater: This work is in the public domain.

Human bones: This file comes from Wellcome Images via Wikimedia Commons.

Human heart: © Patrick J. Lynch via Wikimedia Commons

Laotian rock rat: This photo comes from PLOS One.

Monarch on milkweed: © Katja Schulz via Wikimedia Commons

Mt. Everest camp: © Daniel Oberhaus via Wikimedia Commons

Nepenthes bicalcarata (pitcher plant): © Hans Breuer via Wikimedia Commons

Offshore wind farm: © Kim Hansen via Wikimedia Commons

Polar Bear: © Arturo de Frias Marques via Wikimedia Commons

Stinging tree: © Thomas Durek