A team of researchers developed a new vaccine that is effective against multiple strains of a common virus.

A city expanded its bike-sharing program to include 500 new electric bikesAn airline announced it would offer free checked bags for military personnel and their families

A study showed that teachers who receive regular feedback improve their teaching effectivenessThe government invested $400 million in building new solar farms in the southwestA toy company released a line of science kits that let kids conduct chemistry experiments at home

A 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 areas

A famous poet was awarded a lifetime achievement award for their contributions to literatureA hot air balloon made an emergency landing in a park with all passengers escaping unharmed

A study showed that eating a breakfast high in protein can reduce hunger cravings throughout the dayThe postal service announced it will expand its package delivery service to include Sunday deliveries

Volunteers planted 10000 trees in a deforested area as part of a reforestation projectA famous musician announced a farewell tour with concerts in 40 cities across the globe

(责任编辑：马兆骏)