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These tattoos can magically' disappear—here’s how they work

How handy would it be if you could make your tattoos invisible for a job interview in the morning and reveal them again for a party in the evening?

These Snakes Cartwheel Out of Dangerous Situations

K. R. CALLAWAY

To escape predators, dwarf reed snakes trade slithering for rolling to safety.

Cyril Hilsum, Who Helped Invent Flat-Panel Displays in TVs and iPhones, Has Died at 101

MICHAEL S. ROSENWALD

The man who helped develop the technology for liquid crystal displays — the screens in flat-panel televisions and laptops — has died at 101.

Swarms of Butterflies Land at New York’s Natural History Museum

ZOË LESCAZE

The cartoonist Peter Kuper has filled a corridor with drawings of monarchs, depicting the beauty of the annual mass migration to Mexican forests — as well as its perils.

Ebola update, AI math scoop and permanent daylight saving time

Ebola outbreak crosses grim milestone, artificial intelligence solves major math problems, and scientists caution against making daylight saving time permanent

Do Animals Grieve?

EMILY ANTHES

The feeling of existential loss was long thought to be uniquely human. But studies of coyotes, cockatoos and other creatures are prompting some scientists to reconsider.