Do you think you already know everything that you're afraid of? Sure, everyone shares some pretty common fears: death, heights, spiders. But there are some terrifying things in the world that you probably aren't aware of that will increase this list.

THERE ARE AMOEBAS THAT ARE CAPABLE OF DEVOURING YOUR BRAIN.

Dwelling on what lies at the microscopic level is often overlooked. But these vicious little creatures should, at the very least, raise alarm. The Naegleria fowleri can be contracted by swimming in lakes or drinking tap-water; they can be found in the United States and United Kingdom.

THE WORLD COULD LOSE ALL OF ITS WHEAT.

A certain fungus known as Ug99 is capable of infecting entire wheat crops. It is common already in many African countries, and could spread to other parts of the world fairly easily. Hard to believe a mold could have that much impact.

MANY BRIDGES IN THE UNITED STATES ARE LIKELY UNSAFE TO TRAVEL ACROSS.

This fact comes as a result of a number of bridges that were surveyed in the US being listed as "fracture critical." What this means is that the slightest break in a bridge's structural integrity could cause the entire thing to collapse. Definitely makes travelling along the overpass a little more frightening.

IF YOU LIVE IN AUSTRALIA, YOU HAVE ONE OF THE HIGHEST LIKELIHOODS OF SKIN CANCER.

It's estimated that two out of three Australians will be diagnosed with skin cancer by the time they're 70. Sadly, no amount of SPF will reduce that statistic, since the island continent doesn't rely on the ozone layer to reflect harmful UV rays.

THE AMOUNT OF BACTERIA IN YOUR BELLY BUTTON IS ALARMING.

While not as critical as the brain-eating amoeba, the amount of bacteria found in the average person's belly button totals to about 1,458. The bacteria even showed signs of non-geographical restrictions, with some of the specimen's only known prior locations being places the test subjects had never been.

YOUR CHILD IS MORE LIKELY TO BE MOLESTED BY SOMEBODY THEY KNOW THAN A STRANGER.

A truly frightening fact to swallow, as public schools predominantly teach the danger of strangers. In most reported cases of rape or molestation, the perpetrator is usually somebody that the victim knows. Becoming paranoid of the surrounding world is that much easier now.

• TOO MUCH WATER CAN KILL YOU.

  While highly unlikely, it is possible to consume too much water, to the point of killing yourself. This is the result of a rare instance in which your body's cells have too much water and burst. The most crucial substance to life is a double-edged sword.

THE DEAD OUTNUMBER THE LIVING 15 TO 1.

This fact shouldn't be that alarming or surprising. But to those that are paranoid of a zombie apocalypse, you should can be more afraid now, since you'll definitely be outnumbered. Thankfully, this shouldn't be too big of a concern, although it's still kind of creepy.