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The human system for excretion is actually pretty great, especially when you start looking at what other animals have. Learn more at HowStuffWorks.

Kylie Jenner's 'surprise' baby was the most liked Instagram photo of all time. HowStuffWorks finds out why people like celebrity baby news so much.

Despite the heartache that often accompanies love, we can't help wanting it and rejoicing when it works. Are we hard-wired to fall in love?

Deer in many states have a brain-wasting disease that gives them zombielike symptoms. HowStuffWorks looks at the danger to humans.

HowStuffWorks looks at suicide risk and the suicide prevention advocates and gun rights supporters who are trying lessen it.

Are human beings lonelier than we used to be? HowStuffWorks looks at the debate on loneliness.

Ultrafine particle pollution isn't yet regulated under federal air quality laws. HowStuffWorks takes a closer look at ultrafine particle pollution.

Are library books and used books clean? HowStuffWorks checks it out.

Would you get in a workout before your flight if there was a gym located at your terminal? HowStuffWorks looks at why there are so few in airports.

Animals lick their babies clean immediately after giving birth. HowStuffWorks wonders why human women don't do the same thing.

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