World News Roundup: 08/17

<p>House Speaker Pelosi calls members back from vacation to vote on a bill to stop more changes at the post office.&nbsp;Democrats open their virtual convention.&nbsp;Our new series:&nbsp;School Matters.&nbsp;CBS News Correspondent Steve Kathan has today's World News Roundup.</p><p>See Privacy Policy at <a href="https://art19.com/privacy" rel="noopener noreferrer" target="_blank">https://art19.com/privacy</a> and California Privacy Notice at <a href="https://art19.com/privacy#do-not-sell-my-info" rel="noopener noreferrer" target="_blank">https://art19.com/privacy#do-not-sell-my-info</a>.</p>