First-ever 3D view shows how killer T cells destroy cancer

US President Donald Trump on Wednesday said he believes NASA has a good chance of returning astronauts to the moon's surface before he leaves the White House at the start of 2029.

Air quality in Europe is improving but more effort is needed to reach the European Union's 2030 targets, the European Environment Agency (EEA) said in its annual report on Thursday.

A major review of 217 trials shows that aerobic exercise is the most effective option for managing knee osteoarthritis. Activities like walking, cycling, and swimming outperformed other exercise types in reducing pain and improving movement. While alternatives like strength training and mind-body exercises help, they are best used alongside aerobic workouts. The findings also confirm that exercise is a safe and essential part of treatment.

Snow cover in the mountains of Greece—an important water source for communities, agriculture and natural ecosystems during the dry summer months—has more than halved over the past four decades, a study has found.