Science News Roundup: SpaceX capsule carrying NASA astronauts slated for August 2 return and Mexican cave artifacts show earlier arrival of humans

Scientists said on Wednesday they had found 1,930 limestone tools, including small flakes and fine blades that may have been used for cutting meat and small points that may have been used as spear tips, indicating human presence at the Chiquihuite Cave in a mountainous region of Mexico's Zacatecas state.

Following is a summary of current science news briefs.

SpaceX capsule carrying NASA astronauts slated for August 2 return

The NASA astronauts who traveled to the International Space Station in SpaceX's first crewed flight in May are expected to return to Earth on Aug. 2 after spending two months in orbit, a NASA spokesman said on Friday. U.S. astronauts Bob Behnken and Doug Hurley will gear up for the final benchmark test of SpaceX's so-called Demo-2 mission: a coordinated splashdown somewhere in the Atlantic Ocean that will cap NASA's first crewed mission from U.S. soil in nearly a decade.

Mexican cave artifacts show earlier arrival of humans in North America

Stone tools unearthed in a cave in central Mexico and other evidence from 42 far-flung archeological sites indicate people arrived in North America - a milestone in human history - earlier than previously known, upwards of 30,000 years ago. Scientists said on Wednesday they had found 1,930 limestone tools, including small flakes and fine blades that may have been used for cutting meat and small points that may have been used as spear tips, indicating human presence at the Chiquihuite Cave in a mountainous region of Mexico's Zacatecas state.