Human ancestors used fire to make stone tools 300,000 years ago
Heating the stone tools improved blade production, a technique that wasn't seen again for thousands of years.
Tag: Flint
In the stone-age people recycled flint on purpose to produce precision blades
Second-hand flint, ironically, was more of a precision implement that fresh flint.
Flint’s water is deemed safe, Michigan Governor determined to end free bottled water service
Science says the water is safe to drink. The locals aren't convinced.