Brain suspected that they had been burned by humans because the degree of charring indicated temperatures of more than 1,100 degrees Fahrenheit, while natural grass fires on the savanna burn no hotter than 700 degrees. (discovermagazine.com)
Goldberg and Berna point out that it's unclear whether the cave's inhabitants knew how to start a fire from scratch or depended on flames harvested from grass fires outside the cave. (discovermagazine.com)
For most cars, the heat shield is in several sections (from front to back), and there are 2 «layers» of heat shields: one above the exhaust pipe to keep the heat away from the car, one below the exhaust pipe to prevent you from starting grass fires when you park off the road. (mechanics.stackexchange.com)