Mental Floss

DESIGN

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And firefighters can still use them.

Espeland et al., Current Biology (2018)

Take a deep dive into the butterfly's family tree.

Mars topography visualized on a rainbow scale

Rainbows aren't intuitive at all.

Apple

Curly hair, lobster, and frozen-face emojis have been added.

Lia

It's made out of the same material as toilet paper.

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See how the U.S. stacks up to other countries.

Quentin Blake, courtesy Christie's Images Ltd. 2018

The longtime Roald Dahl collaborator is selling off a collection of preliminary drawings and other illustrations to benefit charity.

Citroën

The liquid in the frames syncs with your sense of balance.

Morfeus Arkitekter. Photo: Silja Lena Løken / Statens vegvesen

This remote roadside toilet puts all other rest stops to shame.

Snøhetta

When it opens in 2021, Svart will be the world's first 'energy-positive' hotel.

Sony Pictures

You may not know its name, but you've likely seen it before.

iStock

Here's why you don't necessarily want more bang for your buck.

Hulton Archive/Getty Images

The film star's death on June 29, 1967 led to lasting safety changes.

Sagar.jadhav01, Wikimedia Commons // ;CC BY-SA 4.0

The illustrated language guide is free to download.

SmithGroupJJR

They'll be topped by plants and trees.

Courtesy of BEDGEAR

There are few things more unpleasant than waking up in the middle of the night covered in sweat. We tested some sheets that promise to keep you cool and dry.