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THE KNOWLEDGE FEED

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How Photo Retouching Worked Before Photoshop

Jocelyn Sears

Photographers and cultural critics have long debated the ethics of retouching—even when it took place directly on the negative in the 19th century.

Researchers Identify a New Species of Beaked Whale

Michele Debczak

Japanese whalers nicknamed it karasu or "raven."

Researchers Identify Two New Carcinogens in Electronic Cigarettes

Anna Green

Researchers at the Lawrence Berkeley National Laboratory recently identified 31 harmful chemicals in e-cigarette vapor, including two probable carcinogens.

This Ivory Tool Was Likely Used to Make Rope 40,000 Years Ago

Kirstin Fawcett

For years, archaeologists have wondered how hunters and gatherers wove plant fibers into tough, strong cord.

8 Years On, Dolly’s Clones Are Doing Just Fine

Kate Horowitz

Dolly herself fell ill and died relatively young, raising concerns that the cloning process might somehow cause accelerated aging.

After-Hours Work Emails Are Bad for Our Emotional Health, Study Says

Anna Green

After-hours work emails can cause emotional exhaustion and burnout.

Rikers Island Opens Its First Ever Permanent Public Library

Andrew LaSane

It's the unofficial 93rd branch of the New York Public Library.

9 Forms of Birth Control Used in the Ancient World

Suzanne Raga

Women and men in ancient cultures used a variety of unusual methods to prevent pregnancy, with differing levels of success (and hygiene).

Tiny Fairy Penguin Hatches at the Bronx Zoo

Michele Debczak

The bird is a member of the smallest penguin species on Earth.

How Tomatoes Fend Off Parasitic Vines

Kate Horowitz

This tomato plant can sense and defend itself against invading plants.

How a Dutch Designer Turns Cow Poop Into Biodegradable Fabric

Andrew LaSane

The extraction process creates material that can be made into plastic, paper, or textiles.

5 Tips Picking a Personal Trainer

Kat Rosenfield

The right personal trainer can help you reach your health and fitness goals. The wrong one could spell disaster.

Four Seasons Restaurant's Furnishings Fetch More Than $4 Million at Auction

Kirstin Fawcett

Someone even paid $10,000 for a set of ashtrays.

Ice Bucket Challenge Helps Fund Discovery of a New Gene Linked to ALS

Anna Green

With the help of 80 researchers in 11 countries, the study authors were able to determine that NEK1 was linked to ALS.

How Olympic Sprinter Stella Walsh Nearly Lost Her Medals Because of Her Autopsy

Suzanne Raga

The woman once regarded as the world's greatest female athlete spent her life—and death—trapped between identities.

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