RT @AsteroidEnergy: Benchmarks: July 22,1960: Mineral discovery ends Meteor Crater debate
vm2.external.earthmagazine.org/article/benchm… http://t.co/9kcEH9ygIs
RT @AsteroidEnergy: Benchmarks: July 22,1960: Mineral discovery ends Meteor Crater debate
vm2.external.earthmagazine.org/article/benchm… http://t.co/9kcEH9ygIs