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Flu: Facts about seasonal influenza and bird flu
Learn interesting facts about the flu, a viral infection that targets the respiratory system.
Mars: Facts about the Red Planet, its moons, and possibilities for life
Discover interesting facts about Mars, its moons, its atmosphere, and the possibilities of life.
Ancient Egypt: History, dynasties, religion and writing
The rich history of ancient Egypt involves power struggles, amazing feats of engineering, advances in writing and art, and more.
Bears: Facts about the furry omnivores that live in many parts of the world
Discover interesting facts about the different types of bears and learn why not all bears hibernate.
Cats: Facts about our feline friends
Discover interesting facts about cat intelligence, how they see the world, and why we keep them around.
Dolphins: Facts about the intelligent marine mammals that use tools to hunt
Discover interesting facts about how dolphins sleep, if they're dangerous, and what they eat.
Whales: Facts about the largest animals on Earth
Discover interesting facts about whales, how big they can get, and how they track down their prey.
How do fitness trackers measure your heart rate?
Everything you need to know about photoplethysmography (PPG), the technology behind heart rate measurements in fitness watches and smart rings.
