The difference between theory and evidence based facts in science

Q: What makes you not believe the multiverse when trillions of blood cells exist in a single adults body, and an different amount in an other adults body all in a creature known as human? Even though their is no proof? Lol? Can you explain more?

Krishna: “Even though there is no proof?” What?!

We don’t use the word ‘proof’. We use the word ‘evidence’ in modern science.

A complete blood count (CBC) is a test panel requested by a doctor or other medical professional that gives information about the cells in a patient's blood. A scientist or lab technician performs the requested testing and provides the requesting medical professional with the results of the CBC. In the past, counting the cells in a patient's blood was performed manually, by viewing a slide prepared with a sample of the patient's blood under a microscope. Today, this process is generally automated by use of an automated analyzer, with only approximately 10-20% of samples now being examined manually (2).

(I know the counts are just approximates. And they differ from person to person)

Researchers published an estimation of the number of cells in the body (3). They used data reported by others about individual organs and some mathematical modeling to obtain their results.

A current estimation of human total cell number calculated for a variety of organs and cell types is presented. These partial data correspond to a total number of 3.72 × 1013 (1).

Adult humans have somewhere around 25 trillion RBCs in their body, on average. Women usually have fewer RBCs than men, while people living at higher altitudes will usually have more (4).

You can count blood cells and even all the cells in a human body directly using scientific methods. You can do it yourself if you want. What more evidence do you need? Go to any lab that can count blood cells in a human body and you will get the evidence.

This is not the case with multiverse. There is a difference between Biology and Cosmology ( that combines Astronomy and Physics).

Cosmology is still in an infant stage. It has to develop a lot to provide evidence. To develop certain fields the human mind has to overcome its limitations. We still are in the ‘trying stage’. So we can only propose theories now. There aren’t ways yet developed to test these theories. So you can only “believe” if you want in multiverse theory.

But a genuine scientist can never be comfortable with the word ‘belief’. He proposes a theory and until evidence is established, it remains a theory. But a theory in science is not just a belief. It will be based on knowledge based guess work. Scientific models are based on available data, not just wild imaginations.

The idea of multiverse is based on two independent, well-established, and widely-accepted aspects of theoretical physics: the quantum nature of everything and the properties of cosmic inflation. There's no known way to measure it, just as there's no way to measure the unobservable part of our Universe. But the two theories that underlie it, inflation and quantum physics, have been demonstrated to be valid (5).

There are plenty of theoretical consequences that are inevitable, but that we cannot know about for certain because we can't test them because of our limitations. The multiverse is one in a long line of those. It's not particularly a useful realization, just an interesting prediction that falls out of these theories.

So multiverse is a scientific theory waiting to be tested. Human blood cell numbers are evidence based facts, not a belief, not a theory either.

Footnotes:

1. An estimation of the number of cells in the human body
2. Blood cell - Wikipedia
3. Revised Estimates for the Number of Human and Bacteria Cells in the...
4. How Many Cells Are in the Human Body? Types, Production, Loss, More
5. What Is (And Isn't) Scientific About The Multiverse