Ammonite fossil from Madagascar Nov 23, 2025

Ammonite fossil from Madagascar

Look closely at this ammonite fossil. Its swirling shell, once home to a prehistoric sea creature, holds a mathematical secret—a spiral pattern. Each new chamber is proportionally larger than the previous one, maintaining a consistent growth ratio, often associated with the Fibonacci sequence.

© ThomasLENNE/Shutterstock

palette

Today in History

Nov 23, 2023Teide National Park, Tenerife, Canary Islands
Nov 23, 2024Spiral aloe, Kangaroo Island, Australia

More Desktop Wallpapers:

Jan 8, 2024Bernina Pass, Graubünden, Switzerland
Oct 20, 2023Pygmy three-toed sloth
Jan 2, 2024Jaswant Thada and Mehrangarh Fort, India
Oct 4, 2023Tarantula Nebula
Sep 28, 2024Gulf Islands National Seashore, Florida, USA
Sep 21, 2023Inside the Nobel Peace Centre, Oslo, Norway
May 12, 2024Guanaco mother and baby
Apr 8, 2025Piazza Maggiore, Bologna, Italy
Jun 3, 2024Bicycles in Copenhagen, Denmark
Dec 18, 2025Temple of the Sun, Capitol Reef National Park, Utah, United States
Feb 10, 2026Es Vedrà and Es Vedranell, Ibiza, Spain
Nov 25, 2024Maasai giraffes
Aug 26, 2025Trullo buildings in Alberobello, Apulia, Italy
Mar 31, 2024A great egret in the Pantanal
Jan 20, 2026Gentoo penguin, Petermann Island, Antarctica
Oct 24, 2024Bodie State Historic Park, California, United States
Aug 6, 2025Ring-tailed lemur
Sep 30, 2025Koala, Australia
Nov 18, 2023Polar bear mother and cubs
May 17, 2025A delta in the Venetian Lagoon, Italy
Jul 4, 2025Orosei, Sardinia, Italy
Sep 3, 2025Boundary Waters Canoe Area Wilderness
May 13, 2025Torres del Paine National Park, Patagonia, Chile
Jan 9, 2024Rio Grande, Albuquerque, New Mexico, USA
Feb 27, 2025Polar bear cub, Churchill, Manitoba, Canada
Nov 5, 2024Lençóis Maranhenses National Park, Brazil
Apr 1, 2025Tree frog, Costa Rica
Aug 26, 2024Palmyra Atoll National Wildlife Refuge
Jun 14, 2025Cinque Torri, Dolomites, Italy
Apr 29, 2024Fujian Tulou, China