Chevron enjoys unusual sway in socialist-led Venezuela, positioning the energy colossus to gain from whatever comes of the crisis between Washington and Caracas.

© Issac Urrutia/Reuters

Under Trump, the N.I.H. is encouraging alternatives that use human cells rather than dogs, cats and monkeys.

A lucrative transaction involving the Trump family’s cryptocurrency firm and an agreement giving the Emiratis access to A.I. chips were connected in ways that have not been previously reported.