Category: human

The Elemental Composition of the Human Body


This post is by Mark Belan from Visual Capitalist


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Elements that make up the human body infographic

The Elemental Composition of a Human Body

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The human body is a miraculous, well-oiled, and exceptionally complex machine. It requires a multitude of functioning parts to come together for a person to live a healthy life—and every biological detail in our bodies, from the mundane to the most magical, is driven by just 21 chemical elements.

Of the 118 elements on Earth, just 21 of them are found in the human body. Together, they make up the medley of divergent molecules that combine to form our DNA, cells, tissues, and organs.

Based on data presented by the International Commission on Radiological Protection (ICRP), in the above infographic, we have broken down a human body to its elemental composition and the percentages in which they exist.

These 21 elements can be categorized into three major blocks depending on the amount found in a human body, the main building block (4 elements), essential minerals (8 elements), and trace elements (9 elements).

The Elemental Four: Ingredients for Life

Four elements, namely, oxygen, carbon, hydrogen, and nitrogen, are considered the most essential elements found in our body.

Oxygen is the most abundant element in the human body, accounting for approximately 61% of a person’s mass. Given that around 60-70% of the body is water, (Read more...)

Ranked: The Life Expectancy of Humans and 49 Other Animals


This post is by Aran Ali from Visual Capitalist


life expectancy of humans compared to animals

Ranked: The Life Expectancy of Humans and 49 Other Animals

For most of history, average life expectancy at birth for humans has stood around 30 years. But thanks to recent breakthroughs in technology and modern medicine, humans are now born with an average life expectancy closer to 80 years.

Some might argue this is one of mankind’s greatest achievements. With this rise in life expectancy, how do human lifespans now rank compared to other animals?

This graphic from Alan’s Factory Outlet covers the life expectancy of 50 different animals ranging from amphibians to arthropods, and even includes one species that’s immortal (well, in theory).

Let’s take a closer look at lifespans in the animal kingdom.

The Longest Living Things

Here are some of the longest living animals, where even with advancements in modern medicine, humans are likely far off from matching.

The Deep-Sea Tube Worm

The deep-sea tube worm, also known as Riftia pachyptila, lives until about 250 years old, though in some cases this can stretch much further.

Amazingly, they have no digestive system, mouth, or anus, and thus do not consume food to survive in a traditional sense. Instead, the bacteria living inside their bodies helps to transform the sulfur from nearby hydrothermal vents into energy.

This makes the deep-sea tube worm one of the few animals on Earth that does not derive its nutrients (either directly or indirectly) from sunlight.

The Immortal Jellyfish

The immortal jellyfish, otherwise known as Turritopsis dohrnii, (Read more...)