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Most creepy, crawly bugs are pretty much harmless when it comes to infectious diseases.

But there are two classes of little critters that cause big — and we're talking big — problems: ticks and mosquitoes.

To learn how climate change could alter the course of tick- and mosquito-borne diseases, we talked to two scientists who have devoted a major chunk of their careers to answering that question.

Let's start with the bloodsuckers that can stay on your skin for days.

What do you want to know about world hunger?

One thing we do know is that more than 20 million people are now at risk of starvation and famine. The United Nations is calling it the biggest humanitarian crisis since the U.N. was founded in 1945. Conflict and drought are blamed for the looming crisis in four countries in Africa and the Middle East: Yemen, South Sudan, Somalia and northeast Nigeria.

Both the U.S. and Uganda have called off the search for notorious warlord Joseph Kony and his followers, the Lord's Resistance Army, saying that Kony's power has dwindled to the point that he's no longer a threat.

The group carried out brutal murders, rapes and mutilations, and was known for kidnapping children and forcing them to become soldiers. Uganda has been battling Kony and his followers for decades, and U.S. Special Operations forces joined the search for the warlord in 2011.

A viral video in 2012 brought Kony international infamy.

Sometimes, it's the Internet of stings.

Juicero, a startup that sells a pricey juice press, found that out firsthand. The company's Wi-Fi-enabled machine produces cold-pressed juice out of packets sold exclusively to owners via subscription.

Updated at 7:15 p.m. ET.

The U.S. Justice Department has escalated its approach to so-called sanctuary cities, writing at least eight jurisdictions Friday to put them on notice they could be failing to cooperate with immigration authorities.

Alan Hanson, the acting assistant attorney general for the Justice Department's grant-making arm, warned the cities that they're required to submit proof that they comply with federal immigration law.

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