nextCarSpeed(currentSpeed, wheelPower, dragForce, mass, deltaTime) =
currentSpeed + ((wheelPower / currentSpeed - dragForce) / mass) * deltaTime
Increase "dragForce", and the resulting car speed decreases. That is a causal input, not an association.Not that I entirely agree with his account but just some food for thought.
I calculate around a 3% drop in speed (from 60mpg) for holding an average sized book out of the window. That's surprising to me.
It's not quite right to use hazard ratios to calculate life expectancy. But if we force it, it looks like being in the top 20% of "regular" sleepers compared to the bottom 20% confers 3-4.5 years of extra life (from birth, assuming everything else equal, assuming USA, etc.). That's 3.8%-5.7% more life (79 year life expectancy at birth in the USA as of 2025). So the numbers are actually close.
I made a bad analogy :)
But you get my point!
They are both causes to speed.
In fact you don't even need flow to infer speed. You can just use pressure calculations and temperature, which is how airplanes measure their speed.
Controlling drag is a major component of the inputs to speed when flying an aircraft.
On the other hand racing stripes have zero impact, but do correlate to the speed of the car.
I have always assumed that, being in a larger vehicle that is bright red, people would be more likely to spot the vehicle from further away, notice it out of the corner of their eye, or that I would generally be MORE visible to other drivers.
I'm sure the correlation insurance companies are looking at is that the driver's of red vehicles are the cause of the higher accident rate.
Only if we know of an intervention that will likely slow the car down and the risks+cost of that intervention justify the benefit.
Otherwise, we worry without purpose.
EDIT: I will say that there is a philosophical question here related to "basic research" / "pure science" / "fundamental science." Usually just "knowing new things" eventually proves valuable, especially in a long timeline. So in that sense, TFA could be important.
Technically the book would add drag and the car would slow down but likely imperceptibly to a mere mortal
But what they are saying is, it would be valuable if it was causative wiggles eyebrows
Last sentence of the abstract:
> Sleep regularity may be a simple, effective target for improving general health and survival.
But why would it NOT be? Seems stupid for us to have evolved into beings that need our sleep to be irregular.
...yes it does?
Presumably, the example missed the part where they stated the book was being held in front by an outside agent, because that is the only way it would make sense.
Nobody goes to bed and wants to wake up 2 hours later.