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..... 2000 B.C. .................. 1000 A.D. .....
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| Here, eat this root. You'll feel much better. | |
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| That root is heathen. Say this prayer. | |
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...... 1850 A.D. ................. 1940 A.D. .....
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| That prayer is superstition. Drink this potion. | |
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| That potion is snake oil. Swallow this pill. | |
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..... 1985 A.D. .................. 2000 A.D. .....
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| That pill is ineffective. Take this antibiotic. | |
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| That antibiotic is artificial. Here, take this root and this herb and you'll feel much better. | |
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