Syringe Reusing:
Can you wait so long to design?
- Same price as the current syringes
- Similar design so that it can be manufactured on existing manufacturing equipment
- Similar usage method so that all the nurses need not be trained again.
追求忘我. Climb the mountain so that you can see the world and not so that the world can see you.
In this article,Race without Colour dated November 1994, Jared Diamond wrote :
“ Among tropical peoples, anthropologists love to stress the dark skins of African blacks, people of the southern Indian peninsula, and New Guineans and love to forget the pale skins of Amazonian Indians and Southeast Asians living at the same latitudes. To wriggle out of those paradoxes, anthropologists then plead the excuse that Amazonian Indians and Southeast Asians may not have been living in their present locations long enough to evolve dark skins. However, the ancestors of fair-skinned Swedes arrived even more recently in Scandinavia, and aboriginal Tasmanians were black-skinned despite their ancestors' having lived for at least the last 10,000 years at the latitude of Vladivostok. “
He goes onto in the article to argue hence it is sexual selection is the reason for our skin colour difference. It is covered here in a more succinct article.
I just like to point out though in Chapter 17 of Guns, Germs and Steel, Jared Diamond points out that the present residents of Southeast Asia, especially Indonesia and Malaysia had come from ancestors who arrived from Taiwan.
This is the reason why present Indonesians and Filipinos have light skins although the presence of the famous Java Homo Erectus fossils proved that humans have occupied at least western Indonesia for a million years – long enough to evolved tropical adaptations like dark skin. Now only the Philippines Negritos have dark skin like the New Guineans
Maybe it is just a case of updated knowledge since Guns. Germs and Steel was wrote many years later.
To answer why the Tasmanians remained dark despite 10,000 years at a high latitude, this page has some answers:
“John suggests that the low genetic variation common among island peoples might be the factor behind why the folks of Oz remained dark. Certainly in the New World there is some variation in skin color among the indigenous peoples, but the tribes of the north remained far darker than equivalent Old World groups (and similarly those of the equatorial regions do not rival Africans, South Indians or Melanesians in complexion).”
Is Agriculture. Or rather choosing to increase food production over limiting growth.
According to Jared Diamond, when our hunter gatherer society start to grow in population at the end of the ice ages, we chose agriculture to feed increasing number of people rather than limiting our population growth. This move has created problems that we still haven't learnt to solve, while the continued presence of hunter gatherer societies after tens of thousands of years proves the viability of the model.
So what are the problems that agriculture has caused for us for it to be the biggest mistake? - Lower nutrition level /less variety of food leading to more health problems/ smaller body builds. (according to archeological finds) - Risk of starvation as we depends on less and less variety of crops - Agriculture leads to crowding and vice versa which lead to the spread of spread of parasites and infectious disease
More importantly, agriculture allows the accumulation of food (impossible for hunter gatherers who have little or no stored food, and no concentrated food sources like farms), which then lead to class division: The appearance of a non food producing elite over the masses of disease-ridden people.
Also the inequality of sexes:
"Freed from the need to transport their babies during a nomadic existence, and under pressure to produce more hands to till the fields, farming women tended to have more frequent pregnancies than their hunter-gatherer counterparts-- with consequent drains on their health."
So why the heck did our ancestors choose agriculture over hunting gathering?
Because a hundred malnourished farmers can still outfight one healthy hunter.
Farming allows us to support more people, though with a lower quality of life. Our mistake was to choose farming over birth control. To most of us, the above argument seems ridiculous. However we belong to the elites: who are dependent on oil and minerals that must often be imported from countries with poorer health and nutrition.