References
Latest References

Bears: Facts about the furry omnivores that live in many parts of the world
By Marilyn Perkins published
Discover interesting facts about the different types of bears and learn why not all bears hibernate.

Cats: Facts about our feline friends
By Stephanie Pappas, Marilyn Perkins last updated
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
By Jess Thomson published
Discover interesting facts about how dolphins sleep, if they're dangerous, and what they eat.

Whales: Facts about the largest animals on Earth
By Jess Thomson published
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?
By Anna Gora published
Everything you need to know about photoplethysmography (PPG), the technology behind heart rate measurements in fitness watches and smart rings.

Dinosaurs: Facts about the reptiles that roamed Earth more than 66 million years ago
By Jess Thomson published
Discover interesting facts about when dinosaurs lived, why they died and how big they got

Best Lego sets for adults 2025: Science, nature & engineering sets for curious minds
By Kim Snaith last updated
From sets celebrating architecture and famous art to clever designs, these are the best Lego sets for adults.

How does rowing affect your heart, and is it different to running?
By Anna Gora published
References Rowing machines and treadmills do not challenge your cardiovascular system in the same way, so what is the science behind it?
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