Kim Jong Nam, the estranged half-brother of North Korean leader Kim Jong Un seen here in a May 2001 file photo, was alleged assassinated at the Kuala Lumpur airport last week. Shizuo Kambayashi/AP hide caption

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Shizuo Kambayashi/AP

China Monitors Assassination Probe Of North Korean Kim Jong Nam

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Noor Rashid Ibrahim (left) of the Royal Malaysian Police speaks about one of the North Korean suspects, with Selangor state police chief Abdul Samah Mat looking on, in Kuala Lumpur on Sunday. Mohd Rasfan/AFP/Getty Images hide caption

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Mohd Rasfan/AFP/Getty Images

Passengers leave the departure hall Thursday at Kuala Lumpur International Airport in Malaysia where Kim Jong Nam was reportedly attacked and killed two days before. Margie Mason/AP hide caption

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Margie Mason/AP

Lee Jae-yong (center), vice chairman of Samsung Electronics, arrives Monday for questioning as a suspect in the corruption scandal that led to the impeachment of South Korea's President Park Geun-Hye. Jung Yeon-je/AFP/Getty Images hide caption

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Jung Yeon-je/AFP/Getty Images

TV screens in Seoul, South Korea, show images Wednesday of Kim Jong Nam, the half-brother of North Korean leader Kim Jong Un. On Tuesday, Kim Jong Nam was killed in Kuala Lumpur, Malaysia. Ahn Young-joon/AP hide caption

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Ahn Young-joon/AP

Third Suspect In Custody After Mysterious Death Of Kim Jong Un's Half-Brother

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Members of the Royal Canadian Mounted Police go through a decontamination procedure after intercepting a package containing around 1 kilogram (2.2 pounds) of the powerful opioid carfentanil, imported from China to Vancouver. China has now added the drug to its list of controlled substances. AP hide caption

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Malaysian police officers stand outside Putrajaya Hospital, outside Kuala Lumpur, where the body of Kim Jong Un's brother was initially brought. STR/AFP/Getty Images hide caption

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STR/AFP/Getty Images

Second Suspect Arrested In Death Of N. Korean Dictator's Half-Brother

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Kim Jong Nam, eldest son of North Korean leader Kim Jong-il, in Beijing in 2007. He died Monday, according to South Korean intelligence. The Asahi Shimbun via Getty Images hide caption

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The Asahi Shimbun via Getty Images

N. Korean Leader Kim Jong Un's Half-Brother Is Dead. But Why?

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Exiled Half-Brother Of North Korean Leader Reported Dead In Malaysia

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Kim Jong Nam, the half-brother of North Korean leader Kim Jong Un and the eldest son of former leader Kim Jong Il, waves to reporters on the Chinese island of Macau in 2010. Shin In-seop/AP hide caption

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Shin In-seop/AP

Once called the "Dutchmen" because of their large noses and large bellies, proboscis monkeys live only in Borneo. Ecosystems that have a lot of diverse animals, like this monkey, also tend to have a lot of diverse viruses. Charles Ryan hide caption

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Charles Ryan

Why Killer Viruses Are On The Rise

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