Kamala Harris secures enough delegate support to become Democratic nominee

US vice president Kamala Harris has attracted the support of enough Democratic delegates to become the party's nominee for president. Already on the campaign trail, she laid out her plans in her first campaign speech. With Indian and black heritage, she is considered a strong candidate for capturing the votes of America's minority communities. We'll look at the importance of this voting block .

We'll return to the Caribbean island nation of Grenada and assess the reconstruction effort following Hurricane Beryl.

And new research on chemical activities on the ocean floor have found a new source for the oxygen that we all breath.