Readers react to an essay on how President Trump’s speaking style is changing our language. Also: A warning from Canada; an argument for shutting down the N.I.H.

They hoped to make tomorrow’s medicines. Then came Trump.

They hoped to make tomorrow’s medicines. Then came Trump.

Data can easily be manipulated to show causation that doesn’t exist.

The U.S. risks not just being left behind, but out of the game entirely.