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Mourning doves are songbirds that are quite common in North America. Small and thin, mourning doves are approximately 12 inches in size. These birds are fawn-colored with black spots and long, distinctive tails. There are many interesting facts about mourning…
Penguins are found in the lower portion of the southern hemisphere. Some penguin breeds make a home in southern Africa and South America, but many penguins brave the extreme cold of antarctica and its surrounding islands. Up to seven species…
Acceleration due to gravity causes a falling object to pick up speed as it travels. Because a falling object’s speed is constantly changing, you may not be able to measure it accurately. However, you can calculate the speed based on…
Breezes are the result of differences in air temperature. Warm air rises, leaving behind low pressure near the ground. Cold air creates high pressure and sinks to compensate; wind then blows from areas of high pressure to areas of low…
There are more than 390,000 types of living plants on Earth. Many plants you may recognize – such as trees and flowers – reproduce and multiply by making seeds. There are also many types of non-seed plants on Earth, including…
The Nile advanced the civilization of ancient Egypt. The river’s annual floods left soil rich enough to feed a large and complex society — and to grow a plant whose fiber was used for all kinds of household, fishing, farming,…
Apple trees, members of the genus Malus , are often inconspicuous during the times of year when they are not decked out in showy flowers or covered in brightly hued ripe fruits. Additionally, many wild or unpruned apple trees flower…
When you step out onto your lawn in the summertime, you’re likely to notice the warm sunshine, the birds chirping and a dragonfly or two flitting through the sky. But occasionally, you might notice unusually large numbers of dragonflies swarming.…
Water barometers are a beautiful and functional piece of home decor. There is an old-fashioned elegance to reading the weather this way, and it’s amazing how accurate such a simple device can be. Luckily, it’s also simple to read. To…
Linear programming uses mathematical equations to solve business problems. If you have to decide, for example, how many and how much of four different product lines to manufacture for Christmas shopping season, linear programming takes your options and mathematically calculates…
