Why cashew shells are toxic
An overview of cashews and their toxic shells.
Encyclopædia Britannica, Inc.
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Encyclopædia Britannica, Inc.Learn more about the six basic types of simple machines.
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© 2026 Thomson ReutersOne robot ran a sub-9 second 100-meter dash in a 2026 competition—and promptly crashed into a padded wall.
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Encyclopædia Britannica, Inc.Learn about the origins and diversification of uncrewed aerial vehicles, or drones, from early military models to modern consumer-level devices.
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Encyclopædia Britannica, Inc.Learn about nutritious foods that contribute to a healthy and balanced diet.
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© American Chemical Society (A Britannica Publishing Partner)Learn how the oil urushiol, secreted by poison ivy (Toxicodendron radicans), causes allergic reactions and how those reactions can be treated.
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Video by Neil Bromhall; music, Musopen.org (A Britannica Publishing Partner)Time-lapse video, filmed over eight months, of an oak seedling growing from an acorn.
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DaleJohnson/Pond5.comWatch a tree shaker harvesting pecans. The same method is employed to harvest almonds.
