Discover 4

April 2018^ DISCOVER^3

Contents

APRIL 2018

VOL. 39, NO. 3

32 Pigment of

Our Imagination

Known for its use in

prehistoric cave paintings,

ochre might also have helped

fuel early human brain

development and our species’

expansion around the globe.

BY GEMMA TARLACH

42 Can CRISPR

Feed the World?

Scientists are developing a

gene-editing tool that could

eliminate disease in Florida

citrus and other crops. But

will a skeptical public eat the

produce? BY ERIC BETZ

52 Future Wear

Clothing has traditionally

been worn for style and

protection against the

elements. A textile researcher

has a broader vision

for our garb that could

upend the industry.

BY JONATHON KEATS

60 Into the

Mystic

People with a chronic or

terminal illness can experience

profound anxiety over their

condition. Psychedelic drugs

may help alleviate their

suffering. BY LAUREN SLATER

PHILIPPE PSAILA/SCIENCE SOURCE

FEATURES

Ochre comes in many colors

and likely had both functional

and symbolic uses for our

hominin ancestors. Read more

on page 32.

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