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Does the Heart Ever Skip a Beat? There's nothing romantic about your heart skipping a beat, whatever the poet might say.
What Does the Sun Burn? We all know that there is no air in space, and therefore no oxygen to burn.
How Many People Cheat on Taxes? The U.S. Treasury figures $250 billion or more a year in lost taxes.
Is There a Hangover Cure? Common things said to work (by people who are arguably impaired, anyway) include fresh air, coffee or a morning bloody Mary.
Does a Virus Really Cause Cervical Cancer? There are about 10 "high risk" types of genital human papillomaviruses (HPV) that increase the risk of cancer of the cervix, vulva, vagina and anus in women, and of the anus and penis in men.
What is the Fate of Earth? Even if we survive the looming 90-year drought and the unknown ultimate consequences of climate change, and even if anti-aging research pans out and you can hang in there a couple more billion years, eventually we're all toast.
How Many Cells are in the Brain? The complexity of the task requires a fairly inconceivable 100 billion neurons, interconnected via trillions of synapses.
Is Snow Always White? Multi-hued snow, usually found in polar regions during the spring and summer months, results from dozens of species of algae. Dust can do the trick, too.
What Makes Wheels Appear to Spin Backward? Two competing theories are currently rolling around the academic journals for acceptance.
What's So Special About Darwin's Finches? People refer to "Darwin's finches" from time to time as a symbol of evolution in the Galapagos Islands, but the father of evolutionary theory actually dropped the ball on those birds, collecting better details on mockingbirds, tortoises and other species.
Why Can't We Reach the End of the Rainbow? You'll never swim out to the horizon, and you'll never reach a rainbow's end. The visibility of both requires distance between object and observer.
What is a Sonic Boom? Can I See One? The sound barrier is just a certain velocity relative to the surrounding environment, not an actual membrane to be penetrated by a jet's nose. Yet we have photos.
What is a Species? When Does Speciation Occur? Determining which categories an organism falls into is no easy matter. In general, physical characteristics determine grouping.
Can Men Get Breast Cancer? Cancer involves a group of rapidly growing, abnormal cells. This growth can occur in the breast tissue of either gender. Cancer does not discriminate.
What is Fire? Prometheus stole fire from the gods and bequeathed it to humans. Aristotle defined it as one of the four essential elements.
Why Do Guys Get Sleepy After Sex? or many women, the correlation between sex and snoring is one of those annoying facts of life.
Why Does a Guy Use a Wingman When Picking Up Chicks? Perception is everything. How attractive a girl finds a guy could have to do with how he compares with his friend.
How Fast Does Earth Move? As passengers on Earth we are all carried around the sun at a mean velocity of 66,600 mph. Add to that dizzying notion the fact that we are spinning around the planet's axis. Now you've only begun to graph how fast we move.
Is Cow-Tipping Possible? The physics of cow-tipping, to the extent that much is known about it.
If Global Warming is Real, Why is it Still Snowing? Some media outlets love to point out such oddities. It makes for great headlines.
Why Do People Kiss? But there are people for whom this explanation isn't quite sufficient. But philematologists seek a deeper answer.
Why is Ice Slippery? The chemistry of ice.
Do Labyrinths Have Healing Powers? Labyrinths are ancient, maze-like patterns. Unlike a maze, however, you cannot get lost in a labyrinth, as there is only one path to the center and back out. Well, at least that's comforting.
How Does a Snake Swallow a Larger Snake? Kate Jackson of the University of Toronto and colleagues used an array of video and still images to get a play-by-play look at king snakes as they devoured corn snakes that were at least as long.
What are Growing Pains? The pains are real, but they are not caused by the child's growing body.
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