| 1 | But how will the Fed change? | |
| 2 | Engineers calculate the strains and stresses on a bridge. | |
| 3 | One is the resilience of its political structure to stress of this kind. | |
| 4 | It is one way to enhance resilience, experts say, but there are others. | |
| 5 | So this moment was a test not only of his speed but also of his flexibility. |