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Flu Pandemics in the 20th Century

If a flu virus emerges that is either new or that has not circulated in many years, and if it is able to spread easily from person to person, it could quickly travel around the world and cause serious illness and death for millions of people. This is called a flu pandemic. The 1918 Spanish flu pandemic is the catastrophe against which all modern ...

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FluPandemics
Medicine

What is Herd Immunity?

No vaccine is 100% effective and usually does not work in 5% of those immunized. In addition, another 5% lose immunity after time. That means that, even after you are immunized, you could contract the ... Continue reading

WhatisHerdImmunity
Medicine

It's Hay Fever Season!

If spring's flying pollen is making you sneeze, you are not alone. Some 40 to 50 million people in the United States complain of respiratory allergies, and experts estimate that three to four million ... Continue reading

HayFever
Mathematics

Leaps and Bounds

Leap years are years with 366 days, instead of the usual 365. Leap years are necessary because the actual length of a year is 365.242 days, not 365 days, as commonly stated. Basically, leap years ... Continue reading

LeapsandBounds
Astronomy

The Color of The Sunset

Color in the form of pigment does not exist in the atmosphere. Instead, the color we see in the sky results from the scattering, refraction, and diffraction of sunlight by particles in the atmosphere, ... Continue reading

SunsetColor

Fibonacci Patterns In Nature?

FibonacciOften it takes a second look to see how mathematical numbers and patterns fit into the natural world. Numbers, after all, are manmade. However some very interesting number patterns underlie some natural systems in a surprising way. One such number pattern is called the Fibonacci Series, where each subsequent number is the sum of the two preceding numbers. For example 0, 1, 1, 2, 3, 5, 8, 13, 21... The next in the series is 13 + 21 = 34, and so on.

The trick with mathematical patterns is to see them in the first place, and it wasn't until the 13th century that Leonard Fibonacci, of Pisa, Italy, first described this series in a book on calculations. Since that time, scientists have found the Fibonacci Series in many different places. In the plant kingdom petals on flowers and leaves on stems are often arranged in groups of 3s, 5s and 8s. Pine cones, too, show the same series. In the animal kingdom, the spirals of seashells can be found following the series, as can genealogical patterns of honey bees.