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What Is a Second Cousin? Unraveling the Family Tree
science.howstuffworks.com/life/biology-fields/cousins-tutorial.htm
Cousins are indeed complicated. Who's your first cousin once removed? What is a second cousin? And what are kissing cousins? We'll tell you.
How Twins Work
science.howstuffworks.com/life/genetic/twin.htm
Twins are unique people who are also eerily similar to each other. Do twins really have ESP? Learn how twinning happens and what types of twins are out there.
Frequency Formula Basics: 2 Ways to Calculate Frequency
science.howstuffworks.com/math-concepts/frequency-formula.htm
Frequency is a fundamental concept when you're talking about waves, whether that means electromagnetic waves like radio waves and visible light, or mechanical vibrations like sound waves.
SCIFs Are Spy-proof Places for America's Top Secrets
science.howstuffworks.com/engineering/structural/scif.htm
SCIFs are spy-proof, highly secure facilities designed for viewing and working with sensitive national security secrets. We talk to a former general counsel for the NSA to find out how they work.
4 Wild Ways Scientists Have Innovated With CRISPR
science.howstuffworks.com/life/genetic/crispr-innovations-news.htm
CRISPR is the genius behind innovations that seemed impossible a decade ago. Could you grow tomatoes with the kick of hot sauce or ferment wine that doesn't cause a hangover? That's just two of the things scientists are looking into.
Is Permafrost Really, Well, Permanent?
science.howstuffworks.com/environmental/earth/geology/permafrost.htm
Permafrost across the globe is rapidly melting. What could this mean for the future of the planet?
The Stratosphere Is Home to Earth's Ozone Layer
science.howstuffworks.com/environmental/earth/geophysics/stratosphere.htm
The stratosphere is one of Earth's five atmospheric layers that also includes the troposphere, mesosphere, thermosphere and exosphere.
How Light Microscopes Work
science.howstuffworks.com/light-microscope.htm
The human eye misses a lot -- enter the incredible world of the microscopic! Explore how a light microscope works.
10 Extinct Hominids
science.howstuffworks.com/environmental/earth/geology/10-extinct-hominids.htm
Decades of fossil discoveries have revealed much about the extinct members of our hominid family tree, but we're far from having all the answers. What have we learned from some of these fascinating finds?
How Cloning Works
science.howstuffworks.com/life/genetic/cloning.htm
Cloning is the process of making a genetically identical organism through nonsexual means. In this article, we will examine how cloning works and look at possible uses of this technology.