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clock-iconPUBLISHEDMarch 29, 2026

How Do We Know That The Earth Has A Tilt? Find Out More In Issue 45 Of CURIOUS – Out Now

What came first: the chicken or the egg? Could you turn a flamingo blue? All this and more exclusively in the latest issue of our e-magazine.

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The cover of IFLScience's CURIOUS magazine as shown on an iPad. The background is dark blue-black with an illustration of the Earth on a tilt. The cover line in white says “how do we know that the Earth has a tilt?”

This issue's cover story: How do we know that the Earth has a tilt?

Image credit: Zaie/Shutterstock.com; modified by IFLScience

Issue 45 (April 2026) of CURIOUS is out now, bringing you science highlights for the month plus deep dives into intriguing topics, interviews, exclusives, diary dates, and explanations for some of Earth’s most perplexing natural phenomena and landscapes.

The rest of this article is behind a paywall. Please sign in or subscribe to access the full content.

Read Issue 45 of our digital magazine now by clicking below! Use the arrows or scroll to navigate, or download the PDF for easy access.

In This Issue…

OUR COVER STORY: How Do We Know That The Earth Has A Tilt?

Our ancestors clearly knew the Earth had a tilt, but who were the first to figure it out?

DEEP DIVE: What Came First: The Chicken Or The Egg?

It’s one of the greatest questions, but there is an actual answer.

WE HAVE QUESTIONS: Could You Turn A Flamingo Blue?

And how you go about keeping them gloriously pink.

WHERE ON EARTH: Chapel Of Bones

Portugal’s Capela dos Ossos is decorated with thousands of human bones.

Exclusive: Meet author David George Haskell and read an excerpt from his new book How Flowers Made Our World: The Story of Nature's Revolutionaries.

Plus: News, diary dates, what to see, watch, and read this month, and much more.


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