Take the interactive quiz.

"Start by writing short, declarative sentences.

"In his fourth book, "American Nations: A History of the Eleven Rival Regional Cultures in North America," award-winning author Colin Woodard [photo, left] identifies 11 distinct cultures that have historically divided the US.

Helen Coster (photo, left) presents "10 Tips for Better Business Writing.

"New research by Dr.

"Luckily, there are signs we can look for when trying to detect a lie.

"I normally introduce myself by my first name.

"Asiana Airlines flight 214 crashed upon landing at San Francisco International Airport on June 6, 2013.

"Facial expressions are a universal language of emotion, instantly conveying happiness, sadness, anger, fear, and much more.

According to Drake Baer, "Within moments of meeting people, you decide all sorts of things about them, from status to intelligence to promiscuity.

"In honor of National Etiquette Week and our just-published list of the 45 best restaurants in America, we decided to clear up some common etiquette questions," writes Megan Willett.

See Damon Nofar's slideshow - 8 Tips for an Awesome PowerPoint Presentation - at BusinessInsider.

Take this interactive test to see how well Bovee and Thill's textbooks compare to other textbooks in the vital area of mobile business communication.

Bovée and Thill Web Search is a custom metasearch engine that automatically formats more than 300 types for searches for optimum results.

Take this quiz to see if you have the knowledge to travel like a pro.

Haiku Deck gives their picks for "Decks of the Year.

"Public speaking is hard enough without shooting yourself in the foot with simple mistakes.

Ben Schott (photo, left) presents his ten words.

Only one author team is writing about mobile business communication: Bovee and Thill.

"Some studies say you've only got 15 seconds to grab an audience's attention, while others say it's closer to a minute," writes Richard Feloni of BusinessInsider.

"Launching a product is hard to do," says Drake Baer of BusinessInsider.

"When [Gayle] Cotton (photo, left) began her career working at the United Nations in Geneva in the early-90s, she answered a routine phone call with a polite, 'Hello, how are you?

According to Richard Feloni, "Once you finish your written speech or PowerPoint slides, you're only halfway done preparing a great presentation.

According to Melia Robinson (photo, left), "It's the cheapest, most low-tech life hack you'll find.

"Here are 11 email etiquette rules you should always follow at work.