Why, in 1984, did Dr. Barry Marshal drink a petri dish containing the bacterium Helicobacter pylori ?

Stomach Ulcers

Prevailing Medical Wisdom (prior to 1984)

Treatment: Lifestyle & Ongoing medication

Stomach Ulcers

Prevailing Medical Wisdom (prior to 1984)

Treatment: Lifestyle & Ongoing medication

Treatment: One time antibiotics

The truth (known after 1984)

NAEP Math

NAEP Math

NAEP Math

If the problem were primarily insufficient data

or insufficient practice, then a 5–10× increase

in spend should have moved the needle... But it didn't

We're treating the symptoms not the cause

If the problem were primarily insufficient data

or insufficient practice, then a 5–10× increase

in spend should have moved the needle... But it didn't

NAEP Math

Bransford and Johnson 1972

Bransford and Johnson 1972

If the balloons popped, the sound would not be able to carry since everything would be too far away from the correct floor. A closed window would also prevent the sound from carrying since most buildings tend to be well insulated. Since the whole operation depends on a steady flow of electricity, a break in the middle of the wire would also cause problems. Of course the fellow could shout, but the human voice is not loud enough to carry that far. An additional problem is that a string could break on the instrument. Then there could be no accompaniment to the message. It is clear that the best situation would involve less distance. Then there would be fewer potential problems. With face to face contact, the least number of things could go wrong.

Bransford and Johnson 1972

Bransford and Johnson 1972

If the balloons popped, the sound would not be able to carry since everything would be too far away from the correct floor. A closed window would also prevent the sound from carrying since most buildings tend to be well insulated. Since the whole operation depends on a steady flow of electricity, a break in the middle of the wire would also cause problems. Of course the fellow could shout, but the human voice is not loud enough to carry that far. An additional problem is that a string could break on the instrument. Then there could be no accompaniment to the message. It is clear that the best situation would involve less distance. Then there would be fewer potential problems. With face to face contact, the least number of things could go wrong.

3x = 30

x + 2y = 20

y + 2z = 9

y + zx =

?

Solve

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