Amsterdam’s train tunnels reveal surprising windows into the past


Scientists have long believed our planet is built upon four layers of rocks, minerals and magma deposited over millions of years of existence.

But researchers now think the world has five major layers after discovering a previously undetectable 400-mile-wide ball of iron inside Earth’s inner core. The revelation could help experts understand more about the origins of the place we call home.

Like what you’ve read? Oh, but there’s more. Sign up here to receive in your inbox the next edition of Wonder Theory, brought to you by CNN Space and Science writers Ashley Strickland and Katie Hunt. They find wonder in planets beyond our solar system and discoveries from the ancient world.

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