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The smell of rain - What many describe as the smell of rain is caused by bacteria called actinomycetes.

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Clean mouth - Dental researchers say that a clean and healthy mouth has about 10,000 to 100,000 bacteria on each tooth.

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Beans - Beans cause flatulence because they contain a type of sugar called oligosaccharide, which is not totally digestible for bacteria and results in gas.

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Offices - According to a study conducted by the University of Arizona, office desks have 400 times more bacteria than toilets.

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Cell phone - Researcher Ceri Stanaway revealed during an interview with the Daily Mail that the number of bacteria on a cell phone can be 18 times higher than the number of bacteria found in a toilet.

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A world of bacteria - Several studies indicate that there are more bacteria in one person's mouth than there are people in the world.

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Weight - According to a study carried out by North Carolina State University, a human carries about 1.82 kg of bacteria in their body. This is enough to fill a large soup bowl!

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Virus - Bacteria can also catch viruses.

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Belly button - North Carolina State University conducted research that found nearly 1,500 species of bacteria in the human navel.

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Sweat - Sweat does not smell. It is the bacteria on our skin and that reacts to perspiration, producing the bad odor.

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Keyboards - Dr. Charles Gerba of the University of Arizona concluded that, not only are toilet seats one of the most bacteria-free objects in the house, but also that a computer keyboard has 200 times more bacteria.

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Chocolate - A study by Osaka University in Japan has shown that chocolate can be beneficial to oral health because it has antibacterial properties.

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Chlorine - It is not the chlorine that causes red eyes when you spend a lot of time in the pool, but the chlorine mixed with bacteria in the water.

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Kiss - Research shows that when two people kiss, they trade between 100 million and 1 billion bacteria.

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Tap water - Tap water can be kept for about six months, but after that period, chlorine in the water disperses and bacteria starts to grow.

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Hair spray - In 2008, a new type of bacteria that exists predominantly in aerosol hair spray cans was discovered.

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Notes - A study conducted by Jane Carlton at New York University concluded that a $1 bill can contain about 3,000 bacteria.

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Gonorrhea - Scientists have discovered that the strongest organism in the world is the bacteria that causes gonorrhea. This microorganism can lift 100,000 times its weight.

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Antibiotics - The website digitalworldbiology.com shows how various antibiotics use bacteria and fungi in their composition.

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Resistant - In 2013, a bacteria capable of resisting any type of antibiotic was discovered in New Zealand.

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Men in the office - A study by San Diego State University concluded that offices used exclusively by men contain a lot more bacteria than those used solely by women.

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Cups of coffee - The same professor conducted a study where he demonstrated that about 20% of coffee mugs in an office contain some kind of fecal bacteria.

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New York City subway - A team of researchers at Weill Cornell Medicine found that there are 15,152 types of bacteria and insects in the New York City subway.

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Kitchen sponge - Several researchers have found that sponges accumulate bacteria. There are even studies that show that new bacteria grows in sponges every 20 minutes!

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Babies - Babies do not have any bacteria in their bodies when they are born.

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Titanic - Scientists at Dalhousie University in Canada discovered rust-eating bacteria in the wreckage of the Titanic. Given this, they believe that in about 15 to 20 years, there will be no trace of the famous ship.

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Seat-back trays - A study conducted by travelmath.com concluded that the dirtiest place on an airplane are the seat-back trays. These contain more bacteria than any common object you might have at home.

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Eyes - The eyes of bacteria are the smallest in the animal kingdom, but they are also the largest, relative to their size.

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Tuberculosis - According to the World Health Organization, about one-third of the world's population carries the bacteria that causes tuberculosis, but symptoms never develop.

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