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A meeting of 2 ancient human species in fossil footprints

Scientists have discovered ancient human footprints of 2 different species, showing that they coexisted on the African shore. See the tracks here.

EarthSky Voices

December 5, 2024

Audubon Christmas Bird Count signup has begun

The Audubon Christmas Bird Count, held each winter, is one of the longest-running community science projects. You can help collect important data about birds.

Shireen Gonzaga

December 4, 2024

December birthstone: turquoise, zircon or tanzanite

The December birthstone is 1 of 3 gemstones, the exquisite blue-green turquoise, dazzling zircon, or the magnificent blue-violet tanzanite. Your choice!

Editors of EarthSky

December 1, 2024

Thanksgiving turkey: White meat or dark meat?

Thanksgiving turkey raises an important question: Dark or white meat? Amaze your companions on why different cuts of turkey have different characteristics.

EarthSky Voices

November 28, 2024

MOND and more. Does the universe need a rethink?

MOND theory: There's increasing evidence that astronomical theories don’t match observations. Is it time to rethink our story of how our universe came to be?

Deborah Byrd

November 21, 2024

Carl Sagan and his scientific legacy on his 90th birthday

Carl Sagan would have turned 90 on November 9, 2024. Here's a look at his accomplishments and the contributions he made to the world of astronomy and science.

EarthSky Voices

November 9, 2024

November birthstone: Choose either topaz or citrine

The November birthstone, topaz, comes in lots of colors. It's a much-loved gemstone in jewelry, with myths that date to ancient times. Or choose citrine.

Editors of EarthSky

November 3, 2024

The crater-dome illusion: When your brain inverts the image

The crater-dome illusion happens when you look at an image of a crater and the angle of the light causes it to appear as a dome. Here's how to fix it.

Kelly Kizer Whitt

November 3, 2024