Search Results | human population

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How Shrunken Heads Work

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If you think that shrinking a human head isn't possible, read on at HowStuffWorks for a frightening primer on the ritual and those that perform it.

How HeLa Cells Work

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While HeLa cells have been star players in medical research for decades, the woman behind them remained in the shadows for years. Discover the amazing story of Henrietta Lacks and her immortal cells in this article.

PCBs Are Killing Killer Whales

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A new study paints a grave future for the killer whale, all because of now-banned PCBs. HowStuffWorks looks at the science behind PCBs killing orcas.

What If There Were No Such Thing As Illness?

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It's a crazy thought, but what if cancer didn't exist? And malaria, schizophrenia and every other illness that disrupts our normal functioning? Come along as we investigate what such a world might look like.

What Is the Most Common Eye Color? Over 70% of People Have It

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Eye contact helps build trust and communication whether in business, friendships or romantic pursuits. Its importance in human socialization means that we're more likely to take note of eye color and wonder, "What is the most common eye color?"

Gharial: The Rare Crocodilian With an Extremely Narrow Snout

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The gharial is one of the rarest and most unusual-looking crocodilian species on the planet. Learn more about this unique species and discover what conservation groups are doing to protect gharial populations.

9 Big Hairy Facts About Gorillas

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HowStuffWorks looks at the elusive and powerful gorilla, of which there are two species, the Eastern gorilla and the Western gorilla.

Mosquito Types, Traits, Lifecycle and Repellants

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Mosquitoes are insects that have been around for over 30 million years. Learn about mosquitoes and find out how to reduce mosquito populations.

How DNA Evidence Works

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DNA evidence is explained in this article from HowStuffWorks. Learn about DNA evidence.

The Fox Snake Is Essential for the Great Lakes Region

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The fox snake is often misunderstood, but it plays a vital role in its ecosystem. Fox snakes are large, nonvenomous and native to the Great Lakes region, where they help keep rodent populations in check.

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