The space agency announced plans to study the surface of Mars for signs of past life

A study showed that teachers who receive regular feedback improve their teaching effectivenessThe government invested $400 million in building new solar farms in the southwest

A toy company released a line of science kits that let kids conduct chemistry experiments at homeA community held a cultural festival featuring traditional music and dance from Latin AmericaResearchers found that air pollution from traffic increases the risk of asthma in children

The transportation ministry added more pedestrian crosswalks in busy downtown areasA famous poet was awarded a lifetime achievement award for their contributions to literature

A hospital started a program to help patients with chronic pain manage symptoms without opioids

A retail store announced it would donate 10% of holiday sales to a children’s charityThe government announced tax credits for homeowners who install solar panels on their roofs

A wildfire in a national forest burned 12000 acres with firefighters working to protect nearby communitiesA new messaging app launched with end-to-end encryption for all user conversations

Local farmers markets started offering online ordering and curbside pickup for customersThe WHO launched a campaign to provide clean drinking water to 5 million people in rural areas

(责任编辑：李克勤)