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4,009 results for: Dogs
- Math
Algebra, Philosophy, and Fun
I don’t often encounter the words “philosophy” and “fun” right next to the term “algebra.” Nowadays, these words don’t seem to fit together comfortably. However, the three terms do appear in the title of an engaging little book called Philosophy and Fun of Algebra, written by Mary Everest Boole (1832–1916) and published in 1909. I […]
- Math
Fibonacci’s Chinese Calendar
In a book completed in the year 1202, mathematician Leonardo of Pisa (also known as Fibonacci) posed the following problem: How many pairs of rabbits will be produced in a year, beginning with a single pair, if every month each pair bears a new pair that becomes productive from the second month on? The total […]
- Math
Pursuing Pursuit Curves
A pursuit curve is the path an object takes when chasing another object. Such a path might result from a fox pursuing a rabbit or a missile seeking a moving target. This set of superimposed “snapshots” shows the lines of sight at regular intervals of four “bugs” chasing one another, all moving at the same […]
- Math
How Far Away?
As you look around, you constantly make decisions about how far away something is–whether it’s a dog sniffing at a nearby tree or a friend down the street. If you were a surveyor, you could measure angles and then use high-school trigonometry to calculate distances. That’s great for drawing a map or establishing property lines, […]
- Math
How Far Away?
As you look around, you constantly make decisions about how far away something is–whether it’s a dog sniffing at a nearby tree or a friend down the street. If you were a surveyor, you could measure angles and then use high-school trigonometry to calculate distances. That’s great for drawing a map or establishing property lines, […]
- Math
Ice Cream Wars
A visit to the supermarket can present a shopper with a bewildering array of choices. For ice cream alone, the consumer faces a variety of brands, flavors, container sizes, and types (fat-free versus low-fat versus premium, and so on). At the same time, deciding which items to stock is a formidable problem for retailers. They […]
- Computing
Games Theory
Online games can not only entertain but also provide valuable data for researchers tackling computer-vision and other tough computational problems.
- Animals
Egg Shell Game
Birds apparently cheat chance when it comes to laying eggs that contain sons or daughters.
- Agriculture
Slugging It Out with Caffeine
Anyone who has raised tomatoes in a moist environment knows the tell-tale sign: Overnight, a ripe, juicy orb sustains a huge, oozing wound. If you arrive early, you might catch the dastardly culprit: a slug. In one test, scientists sprayed soil with dilute caffeine and then watched as slugs, like this one, made haste to […]
- Health & Medicine
A Make-Time-For-Sex Diet?
We’re slaves to our hormones. Teenagers and pregnant women are experts on that topic. Both ride an emotional roller coaster as their bodies produce vacillating amounts of sex hormones. In fact, behind the scenes of all human biology–from conception to death–a delicate interplay of hormones drives everything from the expression of our gender to regulation […]
- Health & Medicine
Selenium’s Value to Prostate Health
Prostate cancer remains the most common malignancy among U.S. men, and internationally it ranks fourth. Though few studies have offered much insight into what triggers this disease, a growing number of researchers have found evidence suggesting that dietary selenium protects men against this cancer. The seafood in this bowl of sushi can be a rich […]
- Health & Medicine
A Forget-Me-Not Dietary Supplement?
By the time most people reach their 40s, the mind has lost some of its youthful nimbleness. They learn a little more slowly. They forget more frequently. Sometimes, they don’t remember where they put the car keys or the name of that popular actor. REMEMBER THIS. Egg yolks are a rich source of choline. National […]
