July 26 (Reuters) - The Delta variant is the fastest, fittest and most formidable version of the coronavirus that causes COVID-19 the world has encountered, and it is upending assumptions about the disease even as nations loosen restrictions and open their economies, according to virologists...

Tunisia faced its biggest crisis in a decade of democracy on Monday after President Kais Saied ousted the government and froze the activities of parliament, a move his foes labelled a coup that should be opposed on the street. In a statement late on Sunday, Saied invoked the constitution to...

Naomi Osaka is into the third round of the Tokyo tennis tournament. The host country’s superstar stepped up her game when she needed to in a 6-3, 6-2 win over 49th-ranked Viktorija Golubic of Switzerland to reach the last 16 at Ariake Tennis Park. The second-ranked Osaka will...

Tunisia's president dismissed the government and froze parliament on Sunday, prompting crowds to fill the capital in support of a move that dramatically escalated a political crisis, but that his opponents called a coup. President Kais Saied said he would assume executive authority with the...