Scientists have long debated when our ancestors first mastered fire - a transformative event that shaped what early people ate and how they lived, and may even have fueled the evolution of the modern human brain. Now, the oldest evidence yet for early humans’ use of fire has emerged from a laboratory at Boston University, where researchers say they have discovered, embedded in ancient reddish slabs of sediment, microscopic flecks of apparent campfires from a million years ago.
Unlimited access to BostonGlobe.com for only 99 cents for the first 4 weeks.Sign up
Are you a home delivery subscriber?
Get FREE access as part of your print subscriptionStart Here
Contact us for help