TIME animals

Why Do Dogs Sniff Each Other’s Butts? Here Comes the Science

An explainer from the American Chemical Society

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You know when you see an otherwise cute and perfect dog with his nose just straight up buried in another dog’s behind, and you’re just like, seriously, dude, why?

This new video from the American Chemical Society explains the science behind this seemingly peculiar behavior — and why the smell doesn’t overwhelm them.

TIME Late Night Highlight

Vin Diesel Shows Jimmy Fallon His Breakdancing Moves

Vin Diesel shows Fallon how he and his brother used to make a little side cash

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Before he got famous, Vin Diesel and his brother were already in the entertainment business — not as actors, but as breakdancers.

Naturally, during last night’s Tonight Show, Jimmy Fallon convinced him to demonstrate a few of his moves. And Diesel obliged, despite wearing dress pants.

Diesel appeared on the show to promote his upcoming movie Guardians of the Galaxy, due in theaters Friday.

TIME Infectious Disease

Everything You Need to Know About the Deadly Ebola Virus Outbreak

A look at the numbers behind the largest ebola outbreak on record, which has so far killed over 670 people

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More than 670 people have died from the latest outbreak of Ebola, a highly contagious virus that is also one of the deadliest human diseases.

Though it’s been almost 40 years since Ebola was first discovered in 1976, there are currently no cures or effective treatments.

Here’s what you need to know about the unprecedented outbreak.

TIME Sierra Leone

Sierra Leone’s Top Ebola Doctor Dead After Contracting Virus

Sheikh Umar Khan, head doctor fighting the deadly tropical virus Ebola in Sierra Leone, poses for a picture in Freetown on June 25, 2014 Umaru Fofana—Reuters

Sheikh Umar Khan fought on the front lines against Ebola and is credited with treating more than 100 victims

Sierra Leone’s top Ebola doctor, Sheikh Umar Khan on Tuesday died from complications of the disease. His death came just days after three nurses who worked with him perished.

Khan served on the front lines of what is now considered the worst Ebola outbreak in history, with 670 dead, primarily in West Africa. He is credited with treating more than 100 victims and has previously been hailed as a national hero. Now, hundreds of condolences are pouring in on Twitter, praising his courage and altruism.

“Khan’s death is yet another recognition that health workers is the group most at risk,” Tarik Jasarevic, a spokesman with World Health Organization, tells TIME. More than 100 health workers have contracted the virus since the beginning of the outbreak and around half of them have died. “This is the first time most of these workers face such an outbreak. We have to equip them with protective gear and train them on how to use it. We also need to make sure there are enough workers. If they work reasonable shifts they can focus not only on the patients, but also on themselves.”

Sierra Leone is the country that has been worst hit by the latest outbreak, but neighboring Liberia is also struggling since the contagion breached its borders. The country’s overland border crossings have been closed since Sunday, and Doctors Without Borders reports that they are only able to provide limited technical support to Liberia’s Ministry of Health and Social Welfare.

The fear is now that the deadly disease could also spread far beyond West Africa, possibly via air travelers. Medical services across Europe are on high alert because of the outbreak, and U.K. Foreign Secretary Philip Hammond told the BBC that the disease is a “threat” to his country.

“There is a risk that the epidemic will spread, but first of all we need to stop it on the ground,” says Jasarevic. “We know exactly what needs to be done, but it requires a lot of resources.”

“We need more treatment centers and experts on the ground, and we need to communicate to communities and families to bring their victims to the centers as quickly as possible in order to increase their chance of survival. We need surveillance systems, safe transports for victims and equipment to carry out burials in a safe way.”

One small bit of good news: The current outbreak has proven to be less deadly than previous strands of the disease. Instead of a 90% mortality rate, 60% of the infected have died. And in some areas in Guinea, the situation has stabilized, with Doctors Without Borders even closing one of its Ebola treatment centers.

The battle against the contagion continues, even if now with one less of its premier soldiers.

TIME Education

These 5 States Have the Best Colleges

Did your state or school make the cut?

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Money ranked the nation’s top 50 colleges, and also took a look at which states have the most of those colleges. From California to New York, here are the top five, followed by the “Top 50″ colleges that are in each of the five states.

TIME Spain

Lionel Messi Faces Messy Tax-Fraud Allegations

The soccer star and his father allegedly owe $5.3 million in unpaid taxes to Spain

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Lionel Messi, the highest-paid soccer player in the world, might be in some serious financial trouble.

Messi and his father have been accused of tax fraud in Spain, and if they — in an unlikely case — are convicted, the pair could face up to six years in prison and nearly $32 million in fines.

TIME viral

Adorable 5 Year Old Really Doesn’t Want Her Baby Brother to Grow Up

"I don't wanna die when I'm a hundred!"

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Video of a five-year-old girl from Phoenix, Arizona, sobbing at the thought of her three-month-old brother growing up is going viral on Reddit.

Decked out in a Princess Sofia dress, Sadie wraps her arm around her little brother Carson, kisses his head, and says at one point, “He’s so cute, and I don’t wanna die when I’m a hundred!” Her brother just smiles, clearly amused by it all and loving the attention.

“She’s cried about not wanting to get older herself in the past, but this was the first time she was upset about her brother,” her father Ryan Miller said in an email statement provided by his brother Alex Miller, who uploaded the video to YouTube. “The funny thing is that this was totally out of the blue — we have no idea what prompted it.”

And to show you how devoted Sadie is to Carson, here’s a photo of the girl reading to him:

Courtesy of Alex Miller

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MONEY Sports

WATCH: Lionel Messi’s Messy Tax Situation

Global soccer star Lionel Messi and his father are facing charges of tax fraud in Spain.

MONEY Shopping

WATCH: Shop This Weekend and Escape the Sales Tax

Several states are suspending sales taxes to encourage shoppers to hit the stores.

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