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Paul Manafort arrives for a hearing at District Court in Washington, D.C., on Friday. A judge ordered him to jail ahead of his trial in connection with alleged witness tampering.

Judge Orders Paul Manafort Detained Amid Witness Tampering Allegations

Paul Manafort had a long career as a Washington wheeler-dealer before Donald Trump hired him to run his campaign in 2016. Now, he is heading to jail.

Judge Orders Paul Manafort Detained Amid Witness Tampering Allegations

Paul Manafort had a long career as a Washington wheeler-dealer before Donald Trump hired him to run his campaign in 2016. Now, he is heading to jail.

SoFi, the robotic fish, swims in for its close-up. MIT computer scientists hope SoFi will help marine biologists get a closer (and less obtrusive) look at their subjects than ever before.

WATCH: Robotic Fish Moves Like The Real Thing — So It Can Observe The Real Thing

MIT researchers unveiled a Soft Robotic Fish prototype in hopes of boosting aquatic observation. It can wiggle like a fish, dive to 18 meters, work autonomously — and hopefully avoid getting eaten.

Arthritis of the knee is very common, and isn't helped by arthroscopic surgery, a study finds.

Arthroscopic Surgery Doesn't Help With Arthritis Knee Pain

This is the latest study to find that arthroscopic surgery doesn't reduce pain for people with knee arthritis, and can cause other problems. The procedure remains popular in the U.S.

WATCH: Robotic Fish Moves Like The Real Thing — So It Can Observe The Real Thing

MIT researchers unveiled a Soft Robotic Fish prototype in hopes of boosting aquatic observation. It can wiggle like a fish, dive to 18 meters, work autonomously — and hopefully avoid getting eaten.

A serving of salmon contains about 600 IUs of vitamin D, researchers say, and a cup of fortified milk around 100. Cereals and juices are sometimes fortified, too. Check the labels, researchers say, and aim for 600 IUs daily, or 800 if you're older than 70.

Does Vitamin D Really Protect Against Colorectal Cancer?

The jury's been out on whether low blood levels of vitamin D increase the risk of colorectal cancer. Researchers say a new review involving more than 12,000 people strongly suggests the answer is yes.

Packages of the anti-anxiety drug Lorazepam are shown, Feb. 15, 2018.

Deaths Linked To Anti-Anxiety Drugs Rise, But Fly Under The Radar

The anti-anxiety drugs Valium and Xanax are among the most widely prescribed medications in the country. And doctors say they can be dangerous.

A woman pushing a stroller walks in front of a Rakuten Cafe store at a shopping district in Tokyo in 2014. Rakuten is Japan's largest e-commerce company.

Walmart To Launch Online Grocery Delivery In Japan, E-Book Sales In U.S.

The U.S. retailing giant is partnering with Japan's biggest e-commerce company with the aim of advancing in a competitive international market. Walmart has also announced layoffs at its headquarters.

Some personal injury law firms now automatically target online ads at anyone who enters a nearby hospital's emergency room and has a cellphone. The ads may show up on multiple devices for more than a month.

Digital Ambulance Chasers? Law Firms Send Ads To Patients' Phones Inside ERs

Personal injury law firms are using location-based mobile ads to target people as they enter emergency rooms. The trend is raising concerns among patients and health privacy experts.

Jennifer Schuble trains at the velodrome in Atlanta this summer before the Paralympics, which begin Sept. 7 in Rio de Janeiro.

A Paralympian Cyclist Gears Up For Rio

Nearly 300 Americans are heading to Rio de Janiero to compete in the Paralympics that begin Sept. 7. For Jennifer Schuble, it's her third time and the cyclist hopes to win gold yet again.

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