BBC News US & Canada

Seven of 20 execution attempts were visibly problematic or took an inordinate amount of time.

A $1bn Nasa mission is expected to transform our view of Earth's water by tracking its rise and fall.

The CIA reiterates it "never engaged" the alleged assassin, Lee Harvey Oswald, as over 13,000 files go online.

The Nasa probe that slammed into a space rock to change its path was helped by the mess it made.

Daniel Duggan is accused of breaking American arms control laws by training Chinese fighter pilots.

Washington makes a renewed effort to strengthen African ties in competition with China and Russia.

Zellers, an iconic but failed retail chain, will soon be revived. Can nostalgia rejuvenate the brand?

Burned hamburgers led to a Texas officer shooting Atatiana Jefferson through her bedroom window.

They're not a silver bullet, but they are extremely effective and expensive.

Dr Claudine Gay is also the second woman to lead the elite Massachusetts college.

Kristi Goncalves' daughter Kaylee was found stabbed to death on 13 November, with no suspect yet identified.

Thousands of people remain without power as a devastating storm system sweeps across the US.

The government seeks a court order to stop the building of the barrier and to remove the containers.

President Joe Biden outlines a funding boost to the continent during a summit in Washington.

The programme allows households to order four rapid tests with deliveries starting next week.