Do I need a third Covid-19 vaccine shot to stay protected? Is it safe to mix vaccine brands? Here’s what we know.
Questions and answers on issues such as how well boosters protect against the Delta variant and how effective they are.
Recent studies have shown that the effectiveness of Covid-19 vaccines is decreasing, though experts say the shots still work well. WSJ explains what the numbers mean and why they don’t tell the full story. Photo illustration: Jacob Reynolds/WSJRead more: WSJ Health »
Early Olympics attendees eat noodles served from ceiling - CNN Video
Watch how noodles, rice and burgers are prepared and delivered by robots at the Beijing Olympics Village. Journalists are among the early attendees having this futuristic experience.