The most skin receptors are present in the fingers.
Scientific method would be the answer.
I think causing a physical change
Answer:
What did researchers learn from terra preta?... Because terra preta is loaded with so-called bio-char -- similar to charcoal -- it also can pull substantial amounts of carbon out of the increasing levels of carbon dioxide in the Earth's atmosphere, helping to prevent global warming.
How is bio-char different from the traditional Amazonian method of creating terra preta? Terra preta owes its characteristic black color to its weathered charcoal content, and was made by adding a mixture of charcoal, bone, broken pottery, compost and manure to the low fertility Amazonian soil. ... Terra preta soils were created by farming communities between 450 BCE and 950 CE..
The BBC's Unnatural Histories presented evidence that the Amazon rainforest, rather than being a pristine wilderness, has been shaped by man for at least 11,000 years through practices such as forest gardening and terra preta.
every living cell in your body is a miniature battery. Your ability to expend energy is very much dependent on the energy you have stored, and your cells’ ability to discharge it on demand. <span>A well functioning body will have a much greater ability to store and discharge energy. It will be able to work a lot longer before it becomes exhausted and before it needs to rest.</span>
