Aclassic method of measuring the retention of material in long-term memory over time is to a. conduct mri scans of the brain at annual or biennial intervals

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Compare the rate of learning material the first time to the rate of learning the exact material a second time to measure the retention of material in long-term memory over time.

The soviet union beat the us to the first successful launch, with the october 4, 1957, orbiting of sputnik 1, and later beat the us to have the first human in earth orbit, yuri gagarin, on april 12, 1961. the "race" peaked with the july 20, 1969, us landing of the first humans on the moon with apollo 11