Humans started using metal tools around 3,000 BCE during the Bronze Age. The first metals used were copper and tin, which were combined to create bronze tools and weapons. This marked a significant advancement in technology and had a major impact on human civilization.
we can start using electric cars or hybrids and stop using hair spray
As soon as there was time, people were using it, dividing their activities according to day and night, for instance.
Humans cannot start tornadoes.
because it is!
gold
silver
copper
19 Th Century, Bessemer and Carnegie mass production process of steel in furnaces
No. Lead, at least, is definitely poisonous.
Predominantly transition metals.
Humans cannot digest metals; so there are no edible metals in the true sense of the word. There are, however, trace metals in certain foods. Iron, for instance.