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Kai, appearing both accustomed to the attention and heedful of it, tended to end each exchange with a playful laugh and the same message: “Have fun, OK?”

A more heedful scientist might have surveyed the Chinese data and begun preparations for tests of his own.

In the end, perhaps heedful of Mr. Netanyahu’s warnings against bringing down one of the most right-wing governments Israel has known, a move that could have had unpredictable consequences, they backed down.

McMillan initially promised to train fissile material handlers to be more heedful of plutonium-handling perils, for example, and to bring the inventory and safety documents guiding their work up to date.

Even Democratic politicians became heedful of the word “stimulus,” which did not help their cause politically.