In the reductionistic approach that dominates science, we've tried to categorize even our own physiology into sperate systems such as the immune system or the metabolic system. A number of beautiful papers show that things are not so segmented as we might think. A thread.

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11 BIG IDEAS OF PHYSICS

via @BlasMoros of @LTCWRK

(Thread 👇)

1. Galilean Relativity

We can never fully grasp, define, or understand a system we are part of.

“Distance provides perspective” and wisdom in life is often about perspective.

2. The Laws of Thermodynamics

The study of the large-scale behavior of systems exchanging work and heat with connected systems or their environment.

- The Transitive Law

- The Law of Conservation

- The “Contrast Advantage” Law

- The “Absolute Zero” Law

3. Newton’s Laws of Motion

Describe how objects in the world move and react to forces.

- The Inertia Law: An object at rest, stays at rest

- Force = Mass * Acceleration (F = ma)

- The Law of Reciprocity: For every action there is an equal and opposite reaction

4. Complexity

A complex system exhibits emergent behavior due to the collective interaction of many individual agents according to simple rules.

Complex systems are sensitive to original conditions, influenced by feedback loops, and buffeted by random outside variables.

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Get a cup of coffee.

In this thread, we'll cover *State Quantities* and *Flow Quantities*.

This mental model can help us analyze many different entities -- from complex engineering systems to publicly traded companies.

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A "State Quantity" is something that's associated with a *specific point in time*.

For example, the number of followers a Twitter account has is a state quantity. This number can go up and down over time. But at any one *specific* time point, it's fixed.

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Similarly, the amount of cash a company has is a state quantity.

This cash balance can also rise and fall over time.

But pick any one *specific* time point -- and the company can only have one *specific* cash balance at that time point.

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By contrast, a "Flow Quantity" is something that's associated with a time *interval* rather than a time *point*.

For example, the number of followers gained by a Twitter account is a flow quantity. It's meaningful only when we specify a time interval (eg, the last 30 days).

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A simple analogy is that a State Quantity is like a photo -- a snapshot at a particular *point* in time.

But a Flow Quantity is like a video -- a record of events that take place during a particular time *interval*.

Azar just released a delusional, alternative history of Covid testing in the US. I’m mad because our testing failures allowed this outbreak to blow-up. We can’t fix our system if we ignore where it is broken. I suspect @PublicHealth agrees.

My fact-check on remarks @HHSGov 🧵

“It is indisputable that the United States has built the most extensive testing system and strategy of any major country,” says Azar.

False. Several countries have had percent positivity ~1% whereas US has never been below 5% and is >10% today. Refs KCDC & USA @JohnsHopkins

"The federal government got out of the way of test development in safe and sensible ways,” says Azar.

False. In Feb, CDC & FDA blocked labs from testing as the disease spread exponentially. I broke this story👇🏼& wrote more like it as the year wore on.

Azar defends questions about why the CDC refused an early German test vetted & distributed by WHO, by saying it was ‘unapproved’ & beneath us.

False. Top US researchers in my stories vetted several tests as early as Feb,& found that the one recommended by WHO was ideal.

Azar refuses to concede that other countries handled Covid better. He attributes Koreas success to less travel, invasiveness & private sector.

False. Korea's gov't marshaled the private sector & tracing success was largely from hiring tons of tracers.