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When do most heart attacks occur -- and why?
health.howstuffworks.com/diseases-conditions/cardiovascular/heart/when-do-heart-attacks-occur.htm
When do heart attacks occur? Well, all year, but there's an especially large spike during the holidays; find out why.
How Long After Sex Does Conception Occur?
How long after sex does conception occur? Visit HowStuffWorks to learn how long after sex conception occurs.
Are There Tornadoes in Europe?
science.howstuffworks.com/nature/natural-disasters/do-tornadoes-only-occur-in-north-america.htm
North America certainly has many claims to fame. It's got the Great Lakes, the Grand Canyon and Niagara Falls -- all pretty impressive stuff. But can it claim tornadoes as uniquely its own -- and if so, what's up with that?
How Do They Determine What Date Easter Will Occur On?
people.howstuffworks.com/culture-traditions/holidays-other/question80.htm
How do they determine what day Easter will occur on? It seems to be different every year.
Thundersnow Only Occurs in 7 of Every 100,000 Thunder Storms
science.howstuffworks.com/nature/climate-weather/atmospheric/thundersnow.htm
This rare phenomenon, sometimes called a winter thunderstorm, occurs when a wave cyclone experiences strong upward motion. Freezing temperatures cause snow to fall as the primary precipitation, often leading to thundersnow, lightning and other dramatic meteorological events.
How do scientists determine if a nuclear blast has occurred?
science.howstuffworks.com/nuclear-detection.htm
In the first reports released since North Korea announced its underground nuclear test on Monday, officials are saying they have found no evidence of a nuclear signature in the air above the blast site.
Top 10 Heart Attack Symptoms That Should Have You Calling 911
health.howstuffworks.com/diseases-conditions/cardiovascular/heart/5-heart-attack-symptoms.htm
There are certain heart attack symptoms that should have you calling 911 pronto. Learn about ten major heart attack symptoms and find out why heart attacks occur at all.
What Causes Thunderstorms?
science.howstuffworks.com/nature/climate-weather/storms/question646.htm
Thuderstorms occur more in the summer than any other month. Find out why thunderstorms occur more frequently in the summer.
13 People with Extra Body Parts
health.howstuffworks.com/human-body/parts/13-people-with-extra-body-parts.htm
Extra body parts can occur more often than people might think. Find out more about 13 people who were born with an extra body part.
Why is puberty coming earlier for girls today?
lifestyle.howstuffworks.com/family/parenting/tweens-teens/earlier-girls-puberty.htm
The earlier a girl's puberty occurs, the more likely she is to face unwanted pregnancies. Learn why the earlier a girls' puberty occurs, the greater the risk.