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Why Do Most Humans Have 23 Pairs of Chromosomes?
science.howstuffworks.com/life/genetic/23-pairs-chromosomes.htm
Nearly every living cell is made of DNA, and every chromosome contains exactly one molecule of DNA. But not all cells are made of the same number of chromosomes.
Why Do People Keep Flaking Out?
science.howstuffworks.com/life/inside-the-mind/emotions/why-do-people-keep-flaking-out.htm
It's not just your imagination - people feel freer to bail out on others at the last minute than they used to. But why?
Why Do People Lie About Things That Are Easily Disproved?
Politicians and celebrities often lie or exaggerate claims that can be easily verified, but why?
Why Do People Usually Walk In the Same Direction?
Do we have a tendency to walk clockwise around the block? Why do sports favor counterclockwise rotation? Does it have anything to do with handedness or driving habits?
Why Do Some People Believe the Moon Landings Were a Hoax?
science.howstuffworks.com/moon-landing-hoax.htm
The moon landings were all part of a highly elaborate hoax, according to some conspiracy theorists. Learn about the moon landings and hoax theories.
Why Do We Get So Much Pleasure From Symmetry?
science.howstuffworks.com/why-do-get-so-much-pleasure-from-symmetry.htm
Why do we love looking at a perfectly stacked display of soup cans or six flower petals around a stamen? Our brains seem wired for it -- but why?
Why Do We Have Leap Years?
science.howstuffworks.com/science-vs-myth/everyday-myths/leap-year.htm
Leap years only come around once every four years. So, why are they so rare and who decided we need them anyway?
Why Do We Sleep?
science.howstuffworks.com/life/inside-the-mind/human-brain/sleep.htm
Every animal sleeps -- some more than others -- but why they do it is a mystery to scientists. Is sleep more than just beauty rest? Could skimping on it kill you? And how much do you really need?
Why Do We Turn Down the Radio When We're Lost?
science.howstuffworks.com/life/inside-the-mind/human-brain/turn-down-radio-when-lost.htm
You've probably experienced that moment where you're driving, get lost, turn down the radio, and then think, "Why did I just do that?"
Why Do We Yawn?
science.howstuffworks.com/life/inside-the-mind/human-brain/question572.htm
What makes us yawn and why does it seem to be contagious? Find the answers to these questions and more about yawning at HowStuffWorks.