What do humans not need to survive?

Some human body parts have become useless over the past few million years. Useless body parts include the appendix, the tail bone, and the muscle fibers that produce goose bumps.

businessinsider.com - 9 useless body parts that humans no longer need - Business Insider

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Some human body parts have become useless over the past few million years. Useless body parts include the appendix, the tail bone, and the muscle fibers that produce goose bumps. Top editors give you the stories you want — delivered right to your inbox each weekday. Loading Something is loading. Thanks for signing up! Access your favorite topics in a personalized feed while you're on the go. download the app Email address By clicking ‘Sign up’, you agree to receive marketing emails from Insider as well as other partner offers and accept our Terms of Service and Privacy Policy Top editors give you the stories you want — delivered right to your inbox each weekday. Loading Something is loading. Thanks for signing up! Access your favorite topics in a personalized feed while you're on the go. download the app Email address By clicking ‘Sign up’, you agree to receive marketing emails from Insider as well as other partner offers and accept our Terms of Service and Privacy Policy Some human body parts serve no purpose despite once having a specific function among our ancestors. The appendix, for example, is not an essential body part (though some research suggests it may act as storage for good bacteria). In some cases, the appendix gets inflamed or ruptures, which requires surgical removal of the organ. Several other body parts used to be important for humans' survival, but they have since become useless. Some of them can be removed, and the absence of them does not lower people's quality of life. Business Insider spoke with Dorsa Amir, an evolutionary anthropologist at Boston College, to learn more about what she calls "evolutionary leftovers." Amir said that if a trait becomes no longer useful but remains harmless to humans, then it tags along for the evolutionary ride. Take a look at nine body parts that remained in the human body despite having no function for millions of years.

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Can bacteria grow in vacuum sealed?

The National Center for Food Preservation warns that there are risks with vacuum sealed food products. Some harmful bacteria that only grow in air-free setting can grow much better and faster in vacuum sealed products than if they were not vacuum sealed.

extension.umn.edu - Vacuum sealing food at home safely - University of Minnesota Extension

There are machines available to vacuum seal food at home. They are called vacuum sealers and they remove air from the food package before sealing.

What are the benefits and risks of vacuum packing foods for storage?

The benefit of removing air from a food package is the increased storage time of refrigerated, dried and frozen foods. If air is not removed when food is put in a package or container, oxygen can cause fats to develop "bad" flavors and change the food's color. The National Center for Food Preservation warns that there are risks with vacuum sealed food products. Some harmful bacteria that only grow in air-free setting can grow much better and faster in vacuum sealed products than if they were not vacuum sealed. Unlike bacteria that spoil food, disease-causing bacteria may not change the color or look of the food. To avoid the risks related to vacuum sealed foods follow these safe food handling tips: Vacuum sealing food does not replace the need to pressure-can or water-bath home canned foods.

Wash hands before and during the vacuum sealing process.

Try not to touch food with your hands. Use clean spoons, tongs or something else to handle the food.

Be sure to keep utensils, cutting boards and counters clean.

Keep vacuum sealed foods in the refrigerator or freezer. Dry food, like crackers and nuts, can be stored at room temperature.

Thaw frozen food in the refrigerator.

Suzanne Driessen, Extension educator

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