Author

Ed Yong

16 key ideas across 2 books, each explained in our own words.

An Immense World

IDEA 1
Each species senses its own world
Yong uses the German idea of the umwelt, the part of reality an animal can sense. Every species, he argues, perceives a different slice of the world, shaped by the senses it has evolved.
IDEA 2
Smell reveals hidden information
Yong describes how dogs, snakes and moths use smell to read their surroundings. A dog's nose, for example, can follow trails and detect information that humans completely miss. To the dog, the world is a map of smells.
IDEA 3
Animals see differently
Yong explains that many animals see colours we cannot, such as ultraviolet light seen by birds and bees. Others see the world in less colour but with sharper motion detection.

IDEA 1
Every animal is a crowd
Yong argues that every animal, including humans, lives with vast communities of microbes inside and on its body. These microbes, called the microbiome, are partners that shape our lives rather than simply germs to be destroyed.
IDEA 2
Most microbes are not enemies
Yong explains that only a small share of microbes cause disease. Many help digest food, train the immune system and protect us from harmful invaders, so seeing all bacteria as enemies is misleading.
IDEA 3
Germ-free animals reveal much
Yong describes experiments with animals raised entirely without microbes. These animals often develop abnormally, showing how much normal growth and health depend on microbial partners. Such studies help scientists see what microbes normally do for their hosts.

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