General science thread

Quote: GenoDRPh

Sublimates at that temp at standard pressure. Flourine is highly electronegative.

Quote: odiousgambit

6 Flouride molecules for each U molecule

Quote: odiousgambit

atoms, not molecules, to make one molecule, let me beat Geno to that correction

Quote:

Pontzer gave some of the Hadza specially treated water to drink that allowed him to monitor their daily metabolic energy use with great accuracy.

The findings were bizarre. Hadza people, when the data was adjusted for their differences in weight, used up a broadly similar amount of energy on a typical day to pretty much all the other populations whose daily energy demands had been studied.

People walking dozens of kilometres a day to track, kill and haul giraffes back to camp apparently burnt a similar amount of energy on a typical day to Americans with cars, well-stocked fridges and office jobs.

Pontzer explained his surprising results through what has become known as the ‘constrained energy expenditure hypothesis.’ The theory suggests that humans, and indeed many other animals, may have a built-in system to keep our overall energy expenditure within a fixed range, no matter how much physical activity we do.

In other words, Pontzer suggests your body generally has a set amount of energy to use each day.