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Viruses can spread through the air in two ways: inside large droplets that fall quickly to the ground (red), or inside tiny droplets that float in the air (gray). In the first route, called droplet transmission, the virus can spread only about 3 to 6 feet from an infected person. In the second route, called airborne transmission, the virus can travel 30 feet or more.

Ebola In The Air: What Science Says About How The Virus Spreads

Turns out, Ebola is transmitted through the air, but it's not very good at spreading through the airborne route. What in the heck does that mean? We dig into the science to clear up the kerfuffle.

A Russian ruble coin is pictured in front of St. Basil cathedral in central Moscow, on November 20, 2014.

Russian Ruble Plummets, And 4 Other Oil-Slump Related Headlines

Slumping oil prices are continuing to have global economic repercussions. At home, that means lower gas prices, but in other countries more dependent on oil, the effects are serious.

President Obama, joined by his daughters Malia, right, and Sasha, center, speaks at the White House, in Washington during the presidential turkey pardon ceremony on Wednesday.

GOP Staffer Resigns After Comments About Obama Daughters

Elizabeth Lauten criticized the first daughters for their actions and appearance during a Thanksgiving Day turkey pardon last week.

HIV activist Maria Mejia found out she was HIV-positive just before she turned 18.

On World AIDS Day, Fighting HIV And Stigma

Fewer than half of Americans who are HIV-positive receive medical care. Advocates and long-term survivors of HIV and AIDS reflect on how the stigma surrounding the virus may play a role.

Bill Cosby Resigns From Temple University's Board

The move was announced Monday, in a short news release in which Bill Cosby cited "the best interests of the university and its students."

Nabor, a small-scale marijuana grower in the northwestern Mexican state of Sinoloa, checks his plants. As legal pot increasingly becomes available in the U.S., Americans appear to be buying more that is grown domestically. Prices for marijuana from Mexico have fallen sharply.

Legal Pot In The U.S. May Be Undercutting Mexican Marijuana

As more U.S. states approve marijuana for medical or recreational use, the price for pot growers in Mexico is falling. This could change the business model for narcotraffickers as well.

Daisy Armstrong began performing poetry when her mother took her to a youth poetry group. Soon, she was winning competitions — but she was also kicked out of school after a slam poetry tour.

From Feeling Lost To Army Strong, With The Help Of Poetry

Daisy Armstrong struggled in school. She was homeless for a time. Then she began performing poetry — and it helped her, a gay woman, find a niche where she never thought she'd belong: the Army.

NAACP Organizes March From Ferguson To Jefferson City

Marchers are walking 120 miles from Ferguson to the governor's mansion in Jefferson City to ask for improvements to policing policies. Melissa Block talks to NAACP President Cornell William Brooks.

White House To Launch Task Force On '21st Century Policing'

President Obama devoted the day to policing issues highlighted by the Ferguson saga on Monday, meeting with his cabinet, local officials and community activists at the White House.

Son Of Ex-Ugandan Dictator Idi Amin Says 'Guardian' Obituary Had Errors

But the British newspaper's ombudsman says that after a thorough review, The Guardian does not plan to revise the 2003 obituary of the Ugandan leader.

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